added a missing RequireVFAdjacency and corrected a bug into the RequireXX for a couple of other adjacency...

git-svn-id: https://vcg.svn.sourceforge.net/svnroot/vcg/trunk/vcglib@4881 e8973e21-934d-0410-ac44-de4585f5606d
Improved management of fauxbit for quad and polygonal meshes in OBJ (did not set the high level polygonal bit) and OFF (wrong faux bits for polygonal faces with more than 4 sides)

git-svn-id: https://vcg.svn.sourceforge.net/svnroot/vcg/trunk/vcglib@4882 e8973e21-934d-0410-ac44-de4585f5606d