group directories are now created in a different tree than the
the project directory so that they can be exported independently of
the project tree to the nodes in a group experiment. The tree is
routed at /groups on boss/users and on nodes.

1. mkgroup,rmgroup,mkproj - Minor changes to reflect new group
   directory location (/groups). We leave a symlink in the old spot to
   maintain compatability, and to reduce the number of different
   directories that a person needs to worry about. So, when a group is
   made, you get a real directory /groups/pid/gid, and a symlink
   /proj/pid/groups/gid that points to the former.

2. tmcd/tmcd.c - Minor change to add the additional group directory mount
   in the mounts command. Only done when pid!=gid for the experiment.

3. tmcd/libsetup.pm and friends - Minor changes to fix the fact that
   mkdir does not create subdirs along the way unless the -p option is
   specified. Needed to create the local directory for the mounts
   returned by tmcd for group dirs. Pushed them out to the sup trees,
   although 6.2 images older than the most recent one are not going to
   work right. No one is using those images though, and we should just
   flush the sup trees.

4. exports_setup.in - Ah, the crux of the issue. I really dislike NFS
   at this point. The original idea was to export a third set of
   directories to nodes that were part of a group experiment. Those
   nodes would get /groups/pid/gid exported, and /proj/pid read-only.
   Well, no such luck. On users, /groups and /proj are both really on
   /q, and the old restriction of mountd not allowing an IP to
   specified more than once on the right hand side for any FS, reared
   its ugly head again. As far as mountd is concerned, /q/groups and
   /q/proj are the same thing, and so it bombed when I tried to export
   them on different lines, since that meant an IP was repeated twice.
   So, I reworked exports_setup, and now for any node that is part of
   a group experiment, it gets this:

	/q/proj/pid /q/groups/pid/gid -maproot=root 155.101.132.26

   which at least allows the individual group dirs to be protected
   from each other, but does not allow /proj/pid to be exported read
   only. Sigh.