Hopefullt final fix for 6802 - acl_xattr.c module: A created folder does not properly...

Hopefullt final fix for 6802 - acl_xattr.c module: A created folder does not properly inherit permissions from parent and 6938 - No hook exists to check creation rights when using acl_xattr module

Volker was right (dammit :-). It's much easier to catch
this case in the create_file() vfs call instead of trying
to do everything inside open() and mkdir(). Hook all these
functions to gain the desired effect.
Jeremy.