- fixed invalid geom in test/regress/standalone
- added a bunch of @ingroup public_api
- beautified isValid.cpp (astyle --style=stroustrup --indent=spaces=4)
Merge branch 'api_cleanup' of github.com:Oslandia/SFCGAL into api_cleanup

Conflicts:
	include/SFCGAL/algorithm/distance.h
	include/SFCGAL/algorithm/distance3d.h
- fixed test (invalid geom)