obs_api revision and improvements: new namespace etc. (#530)

* obs_api revision and improvements: new namespace etc.

* Minor corrections: use unused functions, add missing prototype, added fwd/invcoord to PJ

* Minor correction: MSVC barfs on va_arg type specification. Trying once more with added parens

* Reverting paren correction, which appears to be a non-solution

* Significant improvements to the OBS_API, plus a number of corrections, mostly in test code, to reflect API changes

* Added two missing prototypes

* Adding the proj_transform function and some related checks

* Improvements to proj_transform etc. based on suggestions from Even Rouault

* Reducing the libc include footprint of proj.h - again based on suggestions from Even Rouault

* A few minor corrections

* Eliminate a MSVC warning about non-initialized usage. Not an actual issue, as another check has locked the path, but at least this should calm down MSVC

* Improved support for the errno reset/restore paradigm

* Introduced the internal header proj_internal.h; Moved most non-API stuff from pj_obs_api.c to pj_internal.c

* Adding proj_internal.h to HEADERS_LIBPROJ to solve build problems

* Correcting a few pj...proj blunders in PJ_pipeline.c

* Correcting a few additional blunders in PJ_pipeline.c

* Changed angle-brackets to quotation marks in includes of proj_internal.h

* Some minor build system repairs

* Some PJ_CONTEXT usage simplifications following suggestions by Kristian Evers @kbevers

* Added version numbering to proj.h - Fixes #529

* remove proj_errno_restore macro, provide function implementation

* Add proj_get_definition. Fixes #538

* Added library specific deallocator proj_buffer_free, eliminating a potential cross heap issues on Windows. Thx to Even Rouault for spotting this

* Got rid of a meaningless cast in proj_buffer_free

* Added some missing functions to proj.def (again spotted by @rouault); removed some not-yet-implemented material from proj.h

* Renamed proj_get_definition/proj_buffer_free to proj_definition_create/proj_definition_destroy, for symmetry and clarity

* Renaming the definition handlers to proj_definition_retrieve / proj_free

* Renaming proj_free to proj_release

1 files changed, 42 insertions, 18 deletions

diff --git a/src/proj.def b/src/proj.def
index 3792d3c0..314c4385 100644
--- a/src/proj.def
+++ b/src/proj.def
@@ -89,21 +89,45 @@ EXPORTS
     geod_polygon_testpoint          @87
     geod_polygon_clear              @88
     pj_run_selftests                @89
-    pj_create                       @90
-    pj_create_argv                  @91
-    pj_trans                        @92
-    pj_roundtrip                    @95
-    pj_log_level                    @96
-    pj_err_level                    @97
-    pj_log_func                     @98
-    pj_context_renew                @99
-    pj_context_inherit             @100
-    pj_context_free                @101
-    pj_fileapi_set                 @102
-    pj_log_error                   @103
-    pj_log_debug                   @104
-    pj_log_trace                   @105
-    pj_lp_dist                     @106
-    pj_xy_dist                     @107
-    pj_xyz_dist                    @108
-    pj_find_file                   @109
+
+    proj_create                     @90
+    proj_create_argv                @91
+    proj_destroy                    @92
+
+    proj_trans_obs                  @93
+    proj_trans_coord                @94
+    proj_transform                  @95
+    proj_roundtrip                  @96
+
+    proj_coord                      @97
+    proj_coord_error                @98
+    proj_obs_error                  @99
+
+    proj_errno                     @100
+    proj_errno_set                 @101
+    proj_errno_reset               @102
+    proj_errno_restore             @103
+    proj_context_errno_set         @104
+
+    proj_context_create            @105
+    proj_context_set               @106
+    proj_context_inherit           @107
+    proj_context_destroy           @108
+
+    proj_lp_dist                   @109
+    proj_xy_dist                   @110
+    proj_xyz_dist                  @111
+
+    proj_log_level                 @112
+    proj_log_func                  @113
+    proj_log_error                 @114
+    proj_log_debug                 @115
+    proj_log_trace                 @116
+
+    proj_definition_retrieve       @117
+    proj_release                   @118
+    proj_torad                     @119
+    proj_todeg                     @120
+
+
+    pj_find_file                   @121