Fix OBT/EXP in test
Make 'geometry' the preferred type over 'exact_geometry' and 'ref_geometry' when looking for an overload candidate
Fix triangle storage: store 4 points rather than 3
Make wms unit tests aware of sfcgal
Fix st_straightskeleton declaration
Fix empty processing
Sync with new SFCGAL C API location
Fix a test: POLYGON((0 0 0,2 2 2,3 3 3)) is not a valid polygon !
Add ST_Distance and ST_3DDistance
Add comments on regression tests