Made edits in cvs.

In NFSv3, a client that unlinks an open file renames it to
.nfsjunkXXXX. In some cases, such as removing a directory,
via rm -r, the presence of open files makes the rm fail.
If the server told the client that it can remove open regular
files without fear of the file's filehandle producing NFS4ERR_STALE,
then clients could avoid the nfsXXXX kludge.

It might be nice if we could do this for directories too, but
that would require an open operation for directories.

I suggest adding variable length fields suffixed as:
  opaque  xxx__reserved<>
(xxx is the field prefix)
to the args and results of all new operations. 
This way, the operations can be
revised in a future minor version without replacing them.

We might decide that is too ugly to revise the operation, but this
gives us an option.