[MinGW]mark problem with conversion to nef polyhedron with MinGW
merge
[warning]remove useless typename
remove toNef_Polyhedron_3
Merge branch 'api_cleanup' of https://github.com/Oslandia/SFCGAL into api_cleanup
Merge branch 'api_cleanup' of https://github.com/Oslandia/SFCGAL into api_cleanup
Merge branch 'api_cleanup' of https://github.com/Oslandia/SFCGAL into api_cleanup
Merge pull request #27 from mborne/api_cleanup

Api cleanup