Merge RFC4 (#1865)

This commit is the result of the squashing of rfc4_dev branch in a single
commit. It implements mostly RFC 4 related work.

* Grid handling:
  - remove obsolete and presumably unfinished implementation of grid catalog functionality
  - all grid functionality is in grids.cpp/.hpp
  - vertical and horizontal grid shift: rework to no longer load whole grid into memory
  - remove hgrids and vgrids member from PJ structure, and store them in hgridshift/vgridshift/deformation structures
  - build systems: add optional libtiff dependency. Must be explicitly disabled if not desired
  - add support for horizontal and vertical grids in GeoTIFF, if libtiff is available
  - add GenericShiftGridSet and GenericShiftGrid classes, relying on TIFF grids, that can be used for generic purpose grid-based adjustment
  - add a +proj=xyzgridshift method to perform geocentric translation by grid. Used for French NTF to RGF93 transformation using gr3df97a.tif grid
  - deformation: add support for +grids= for GeoTIFF grids
  - horizontal grid shift: fix failures on points slightly outside a subgrid (fixes #209)

* File management:
  - add a filemanager.cpp/.hpp to deal with file related work
  - test for legacy proj_api.h fileapi
  - proj.h: add proj_context_set_fileapi() and proj_context_set_sqlite3_vfs_name() (fixes #866)
  - add capability to read resource files from the user writable directory

* Network access:
  - build systems: add optional curl dependency
  - add a curl-based default implementation for network related functionality
  - proj.h: add C API to control network functionality, and optionaly provide network callbacks
  - add data/proj.ini with default settings
  - add a SQLite3 local cache of downloaded chunks
  - add proj_is_download_needed() and proj_download_file()

* Use Win32 Unicode APIs and expect all strings to be UTF-8 (fixes #1765)
  For backward compatibility, if PROJ_LIB content is found to be not UTF-8 or
  pointing to a non existing directory, then an attempt at interpretating it
  in the ANSI page encoding is done.
  proj_context_set_search_paths() now assumes strings to be in UTF-8, and
  functions returning paths will also return values in UTF-8.

1 files changed, 0 insertions, 67 deletions

diff --git a/src/nad_intr.cpp b/src/nad_intr.cpp
deleted file mode 100644
index 36ab0a99..00000000
--- a/src/nad_intr.cpp
+++ /dev/null
@@ -1,67 +0,0 @@
-/* Determine nad table correction value */
-#define PJ_LIB__
-#include "proj.h"
-#include "proj_internal.h"
-#include <math.h>
-
-PJ_LP nad_intr(PJ_LP t, struct CTABLE *ct) {
-	PJ_LP val, frct;
-	ILP indx;
-	double m00, m10, m01, m11;
-	FLP *f00, *f10, *f01, *f11;
-	long index;
-	int in;
-
-	t.lam /= ct->del.lam;
-	indx.lam = isnan(t.lam) ? 0 : (pj_int32)lround(floor(t.lam));
-	t.phi /= ct->del.phi;
-	indx.phi = isnan(t.phi) ? 0 : (pj_int32)lround(floor(t.phi));
-
-	frct.lam = t.lam - indx.lam;
-	frct.phi = t.phi - indx.phi;
-	val.lam = val.phi = HUGE_VAL;
-	if (indx.lam < 0) {
-		if (indx.lam == -1 && frct.lam > 0.99999999999) {
-			++indx.lam;
-			frct.lam = 0.;
-		} else
-			return val;
-	} else if ((in = indx.lam + 1) >= ct->lim.lam) {
-		if (in == ct->lim.lam && frct.lam < 1e-11) {
-			--indx.lam;
-			frct.lam = 1.;
-		} else
-			return val;
-	}
-	if (indx.phi < 0) {
-		if (indx.phi == -1 && frct.phi > 0.99999999999) {
-			++indx.phi;
-			frct.phi = 0.;
-		} else
-			return val;
-	} else if ((in = indx.phi + 1) >= ct->lim.phi) {
-		if (in == ct->lim.phi && frct.phi < 1e-11) {
-			--indx.phi;
-			frct.phi = 1.;
-		} else
-			return val;
-	}
-	index = indx.phi * ct->lim.lam + indx.lam;
-	f00 = ct->cvs + index++;
-	f10 = ct->cvs + index;
-	index += ct->lim.lam;
-	f11 = ct->cvs + index--;
-	f01 = ct->cvs + index;
-	m11 = m10 = frct.lam;
-	m00 = m01 = 1. - frct.lam;
-	m11 *= frct.phi;
-	m01 *= frct.phi;
-	frct.phi = 1. - frct.phi;
-	m00 *= frct.phi;
-	m10 *= frct.phi;
-	val.lam = m00 * f00->lam + m10 * f10->lam +
-			  m01 * f01->lam + m11 * f11->lam;
-	val.phi = m00 * f00->phi + m10 * f10->phi +
-			  m01 * f01->phi + m11 * f11->phi;
-	return val;
-}