A couple of goodies

[Ken Murchison]

I applied Bron's patch, with a few small tweaks (hierachy -> hierarchy, 
and changed some of the option caching) to my sandbox.  A couple of 
thoughts before I commit this code:

- Should we actually have the LIST code explicitly suppress DELETED, or 
should we augment the ACLs of DELETED mailboxes to include "-anyone l", 
which will hide them from non-admins?

- Should DELETED be its own namespace?

- Should the "delete_hierarchy" option be changed to "deleteprefix" to 
match up with "userprefix" and "sharedprefix"?

-- 
Kenneth Murchison
Systems Programmer
Project Cyrus Developer/Maintainer
Carnegie Mellon University