Make tests independent of proj-datumgrid

Fixes #1984

- Copy BETA2007.gsb, MD, alaska, conus, ntf_r93.gsb, ntv1_can.dat grids
  from proj-datumgrid to data/tests.
- Replace a couple uses of nzgd2kgrid0005.gsb in tests by ntf_r93.gsb
- Add downsampled/subsetted versions of egm96_15.gtx as tests/egm96_15_downsampled.gtx
  and ntv2_0.gsb as tests/ntv2_0_downsampled.gsb
  This results in a few changes in expected results
- Simpify travis/install.sh due to less configurations to test

This results in a hopefully acceptable increase of the proj-X.Y.Z.tar.gz
from 2.9 to 5.3 MB

4 files changed, 38 insertions, 60 deletions

diff --git a/test/gie/4D-API_cs2cs-style.gie b/test/gie/4D-API_cs2cs-style.gie
index b8512162..1dd2ae54 100644
--- a/test/gie/4D-API_cs2cs-style.gie
+++ b/test/gie/4D-API_cs2cs-style.gie
@@ -55,17 +55,16 @@ expect     16.8210462130   55.1705688946       29.0317
 
 
 -------------------------------------------------------------------------------
-operation  proj=latlong nadgrids=nzgd2kgrid0005.gsb  ellps=GRS80
+operation  proj=latlong nadgrids=ntf_r93.gsb  ellps=GRS80
 -------------------------------------------------------------------------------
-This functionality is also tested in DHDN_ETRS89.gie
+This functionality is also tested in more_builtins.gie
 -------------------------------------------------------------------------------
 tolerance 1 mm
-ignore    pjd_err_failed_to_load_grid
-accept    173                 -45
-expect    172.999892181021551 -45.001620431954613
+accept    2.25                 46.5
+expect    2.250704350387       46.500051597273
 direction inverse
-accept    172.999892181021551 -45.001620431954613
-expect    173                 -45
+accept    2.250704350387       46.500051597273
+expect    2.25                 46.5
 -------------------------------------------------------------------------------
 
 
@@ -74,24 +73,22 @@ expect    173                 -45
 operation  proj=latlong geoidgrids=egm96_15.gtx  ellps=GRS80
 -------------------------------------------------------------------------------
 tolerance 15 cm      # lax tolerance due to widespread bad egm96 file
-ignore    pjd_err_failed_to_load_grid
 
 accept    12.5 55.5   0
-expect    12.5 55.5 -36.0213
+expect    12.5 55.5 -36.3941
 
 direction inverse
 
-accept    12.5 55.5 -36.0213
+accept    12.5 55.5 -36.3941
 expect    12.5 55.5  0
 -------------------------------------------------------------------------------
 operation  proj=merc geoidgrids=egm96_15.gtx  ellps=GRS80
 -------------------------------------------------------------------------------
 tolerance 0.1 mm
-ignore    pjd_err_failed_to_load_grid
 accept    12.5 55.5 0
-expect    1391493.63492   7424275.19462  -36.0213
+expect    1391493.63492   7424275.19462  -36.3941
 direction inverse
-accept    1391493.63492   7424275.19462  -36.0213
+accept    1391493.63492   7424275.19462  -36.3941
 expect    12.5 55.5 0
 -------------------------------------------------------------------------------
 
@@ -107,32 +104,29 @@ with "unusual" axis orders
 operation  proj=latlong geoidgrids=egm96_15.gtx  axis=neu ellps=GRS80
 -------------------------------------------------------------------------------
 tolerance 15 cm      # lax tolerance due to widely distributed, bad egm96 file
-ignore    pjd_err_failed_to_load_grid
 # Broken test. FIXME
 #accept    12.5 55.5  0
-#expect    55.5 12.5 -36.0213
+#expect    55.5 12.5 -36.3941
 #direction inverse
-#accept    55.5 12.5 -36.0213
+#accept    55.5 12.5 -36.3941
 #expect    12.5 55.5  0
 -------------------------------------------------------------------------------
 operation  proj=latlong geoidgrids=egm96_15.gtx  axis=dne ellps=GRS80
 -------------------------------------------------------------------------------
 tolerance 15 cm      # lax tolerance due to widely distributed, bad egm96 file
-ignore    pjd_err_failed_to_load_grid
 # accept    12.5 55.5  0
-# expect    36.0213 55.5 12.5
+# expect    36.3941 55.5 12.5
 # direction inverse
-# accept    36.0213 55.5 12.5
+# accept    36.3941 55.5 12.5
 # expect    12.5 55.5  0
 -------------------------------------------------------------------------------
 operation  proj=merc geoidgrids=egm96_15.gtx  ellps=GRS80
 -------------------------------------------------------------------------------
 tolerance 0.1 mm
-ignore    pjd_err_failed_to_load_grid
 accept    12.5 55.5 0
-expect    1391493.63492   7424275.19462  -36.0213
+expect    1391493.63492   7424275.19462  -36.3941
 direction inverse
-accept    1391493.63492   7424275.19462  -36.0213
+accept    1391493.63492   7424275.19462  -36.3941
 expect    12.5 55.5 0
 -------------------------------------------------------------------------------
 
@@ -143,22 +137,20 @@ Some more complex axis swapping.
 operation  proj=latlong geoidgrids=egm96_15.gtx  axis=nue ellps=GRS80
 -------------------------------------------------------------------------------
 tolerance 15 cm      # lax tolerance due to widely distributed, bad egm96 file
-ignore    pjd_err_failed_to_load_grid
 # Broken test. FIXME
 #accept    12.5 55.5 0
-#expect    55.5 -36.0213 12.5
+#expect    55.5 -36.3941 12.5
 # direction inverse
-# accept    55.5 -36.0213 12.5
+# accept    55.5 -36.3941 12.5
 # expect    12.5 55.5 0
 -------------------------------------------------------------------------------
 operation  proj=merc geoidgrids=egm96_15.gtx axis=sue ellps=GRS80
 -------------------------------------------------------------------------------
 tolerance 15 cm
-ignore    pjd_err_failed_to_load_grid
 accept    12.5 55.5 0
-expect    -7424275.1946 -36.0213  1391493.6349 0.0000
+expect    -7424275.1946 -36.3941  1391493.6349 0.0000
 # direction inverse
-# accept    -7424275.1946 -36.0213  1391493.6349 0.0000
+# accept    -7424275.1946 -36.3941  1391493.6349 0.0000
 # expect    12.5 55.5 0
 -------------------------------------------------------------------------------
 
diff --git a/test/gie/DHDN_ETRS89.gie b/test/gie/DHDN_ETRS89.gie
index a1471a74..0ab577b8 100644
--- a/test/gie/DHDN_ETRS89.gie
+++ b/test/gie/DHDN_ETRS89.gie
@@ -6,7 +6,6 @@ operation proj=latlong datum=potsdam ellps=bessel
 DE_DHDN (BeTA, 2007) to ETRS89 using NTv2 grid. epsg:15948
 -------------------------------------------------------------------------------
 
-require_grid BETA2007.gsb
 tolerance 1 mm
 accept       7.482506019176  53.498461143331  # ETRS89_Lat-Lon
 expect       7.483333333333  53.500000000000  # DE_DHDN_Lat-Lon
diff --git a/test/gie/deformation.gie b/test/gie/deformation.gie
index 848b9e89..b6616f52 100644
--- a/test/gie/deformation.gie
+++ b/test/gie/deformation.gie
@@ -49,7 +49,7 @@ operation   +proj=deformation +xy_grids=alaska +z_grids=egm96_15.gtx
 tolerance   0.1 mm
 ignore      pjd_err_failed_to_load_grid
 accept      -3004295.5882503074 -1093474.1690603832 5500477.1338251457
-expect      -3004295.7025       -1093474.2106       5500477.3444
+expect      -3004295.7000       -1093474.2097       5500477.3397
 roundtrip   5
 
 # Test that errors are reported for coordinates outside the grid.
@@ -70,7 +70,7 @@ tolerance   0.1 mm
 direction   inverse
 ignore      pjd_err_failed_to_load_grid
 accept      -3004295.5882503074 -1093474.1690603832 5500477.1338251457 2000.0
-expect      -3004295.7025       -1093474.2106       5500477.3444       2000.0
+expect      -3004295.7000       -1093474.2097       5500477.3397       2000.0
 roundtrip   5
 
 -------------------------------------------------------------------------------
@@ -100,7 +100,7 @@ tolerance   0.1 mm
 ignore      pjd_err_failed_to_load_grid
 
 accept      12 56  0.0        2000.0
-expect      12 56 -36.5966    2000.0
+expect      12 56 -36.9960    2000.0
 roundtrip   100
 
 accept      12 56  0.0        2011.0
@@ -112,7 +112,7 @@ expect      12 56  0.0        2019.0
 roundtrip   100
 
 accept      12 56  0.0
-expect      12 56 -36.5966
+expect      12 56 -36.9960
 roundtrip   100
 
 
@@ -123,7 +123,7 @@ tolerance   0.1 mm
 ignore      pjd_err_failed_to_load_grid
 
 accept      12 56  0.0        2000.0
-expect      12 56 -36.5966    2000.0
+expect      12 56 -36.9960    2000.0
 roundtrip   100
 
 accept      12 56  0.0        2011.0
diff --git a/test/gie/more_builtins.gie b/test/gie/more_builtins.gie
index 78a504ff..a3e9d398 100644
--- a/test/gie/more_builtins.gie
+++ b/test/gie/more_builtins.gie
@@ -241,35 +241,27 @@ Some tests from PJ_vgridshift.c
 -------------------------------------------------------------------------------
 operation  proj=vgridshift  grids=egm96_15.gtx  ellps=GRS80
 -------------------------------------------------------------------------------
-Appears there is a difference between the egm96_15.gtx distributed by OSGeo4W,
-and the one from https://download.osgeo.org/proj/vdatum/egm96_15/egm96_15.gtx
-N(12.5, 55.5) = -36.021305084228515625  (download.osgeo.org)
-N(12.5, 55.5) = -35.880001068115234000  (OSGeo4W)
-This is annoying, but must be handled elsewhere. We jump through the hoop by
-setting a very lax tolerance.
--------------------------------------------------------------------------------
-tolerance 15 cm
-ignore    pjd_err_failed_to_load_grid
+tolerance 1 cm
 accept    12.5 55.5   0                  0
-expect    12.5 55.5 -36.021305084228516  0
+expect    12.5 55.5 -36.394090697  0
 
 accept    -180.1 0 0
-expect    -180.1 0 -21.2423
+expect    -180.1 0 -20.835222268
 
 accept    179.9 0 0
-expect    179.9 0 -21.2423
+expect    179.9 0 -20.835222268
 
 accept    180 0 0
-expect    180 0 -21.1533 
+expect    180 0 -20.756538510
 
 accept    540 0 0
-expect    540 0 -21.1533 
+expect    540 0 -20.756538510
 
 accept    -180 0 0
-expect    -180 0 -21.1533 
+expect    -180 0 -20.756538510
 
 accept    -540 0 0
-expect    -540 0 -21.1533 
+expect    -540 0 -20.756538510
 
 roundtrip 100 1 nm
 -------------------------------------------------------------------------------
@@ -285,25 +277,20 @@ expect    failure errno failed_to_load_grid
 -------------------------------------------------------------------------------
 operation  proj=vgridshift  grids=egm96_15.gtx  ellps=GRS80     multiplier=0.1
 tolerance 15 cm
-ignore    pjd_err_failed_to_load_grid
 accept    12.5 55.5   0                  0
 expect    12.5 55.5  3.6021305084228516  0
 
 -------------------------------------------------------------------------------
 Some tests from PJ_hgridshift.c
 -------------------------------------------------------------------------------
-operation  proj=hgridshift +grids=nzgd2kgrid0005.gsb  ellps=GRS80
--------------------------------------------------------------------------------
-Note: These data are home grown and suitable for regression testing only
-We need a set of authoritative test cases to test the nzgd2000 grid.
+operation  proj=hgridshift +grids=ntf_r93.gsb  ellps=GRS80
 -------------------------------------------------------------------------------
 tolerance 1 mm
-ignore    pjd_err_failed_to_load_grid
-accept    172.999892181021551 -45.001620431954613
-expect    173                 -45
+accept    2.250704350387       46.500051597273
+expect    2.25                 46.5
 direction inverse
-accept    173                 -45
-expect    172.999892181021551 -45.001620431954613
+accept    2.25                 46.5
+expect    2.250704350387       46.500051597273
 -------------------------------------------------------------------------------