update for new kernel filesystem structure (vfsconf)

Jan-Simon Pendry's and my new mount code

ensure mounts use disjoint parts of the namespace

fix error message

apply realpath to the target directory to avoid loops

4.4BSD snapshot (revision 8.1); add 1993 to copyright

move misc file systems to miscfs

date and time created 92/07/09 13:58:53 by heideman