Assorted set of fixes for PROJString to ISO19111 model:

- createFromPROJString(): take into account axisswap step for Krovak and Transverse Mercator (South Orientated)
- Geocentric export to PROJ4: use datum when possible, and add explicit units=m
- ESRI WKT parser: make it case insensitive to parameter and projection names, and more tolerant about possible parameter name aliases
- import from WKT1 for Polar_Stereographic: don't be case sensitive
- importFromPROJString: allow pm to override datum
- Equidistant cylindrical: add support for non-standard latitude of natural origin, used in a GDAL test case
- tmerc export to PROJString: use 'k' instead of 'k_0'
- pj_ellps: use official value from EPSG for reverse flattening of Airy ellipsoid
- GDAL compatibility: add support for importing odd formulations of Mercator as WKT1, but rejecting them when exporting to PROJ
- Add export of 'Geostationary Satellite (Sweep X)' to WKT1_GDAL via EXTENSION.PROJ4 node
- importFromPROJString: add support for +f
- WKT1 / PROJ4: add support for EXTENSION.PROJ4 nodes and +wktext
- exportToWKT: change way we deal with AXIS by default for WKT1_GDAL
- Improve etmerc handling
- Fix WKT import of peg_point_heading for Spherical_Cross_Track_Height
- International Map of the World Polyconic: change parameter mapping
- exportToPROJ: add alpha parameter
- Hotine_Oblique_Mercator_Two_Point_Natural_Origin: GDAL_WKT1 related fix
- GDAL compatibility improvements in import from PROJ4 / WKT1 for polar stereographic
- Add support for +towgs84 when importing a +proj=geocent
- import from WKT1: add support for an odd Mercator_1SP formulation handled by GDAL
- export to proj4 strings: add +units=m to projected CRS for better GDAL compatibility
- export to proj4 strings: add +no_defs to CRS for better GDAL compatibility

1 files changed, 2 insertions, 1 deletions

diff --git a/include/proj/coordinateoperation.hpp b/include/proj/coordinateoperation.hpp
index 5e3ecf0b..293ba480 100644
--- a/include/proj/coordinateoperation.hpp
+++ b/include/proj/coordinateoperation.hpp
@@ -497,6 +497,7 @@ class PROJ_GCC_DLL OperationMethod : public common::IdentifiedObject {
     PROJ_INTERNAL OperationMethod();
     PROJ_INTERNAL OperationMethod(const OperationMethod &other);
     INLINED_MAKE_SHARED
+    friend class Conversion;
 
   private:
     PROJ_OPAQUE_PRIVATE_DATA
@@ -1296,7 +1297,7 @@ class PROJ_GCC_DLL Conversion : public SingleOperation {
     INLINED_MAKE_SHARED
 
     PROJ_FRIEND(crs::ProjectedCRS);
-    PROJ_INTERNAL void addWKTExtensionNode(io::WKTFormatter *formatter) const;
+    PROJ_INTERNAL bool addWKTExtensionNode(io::WKTFormatter *formatter) const;
 
   private:
     PROJ_OPAQUE_PRIVATE_DATA