hybrid union filesystem prototype

This is the result of my experimentation with trying to do
union-mounts like semantics with a filesystem.  The implementation is
far from perfect, but I think the concept does sort of work.  See the
patch header for the union filesystem.

VFS modifications necessary to make it work:

  - allow f_op->open() to return a different file
  - pass dentry to i_op->permission() instead of inode
  - hack to vfs_rename() to allow rename to same inode

Git tree is here:

  git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git union-hybrid

Thanks,
Miklos
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