(can_* == can_read, can_write, and can_create)
See top of contrib/adc/adc.common-functions for more on this.
Note: the old style (calling get_rights_and_owner with $repo, then
checking $perm_read, $perm_write, etc.), will still work fine.
The sudo adc should make life easier for any admin wishing to run an adc
as some other user.
As a result, the rmrepo adc also goes back to its simple roots. Now you
just run it via the sudo adc if you (as gitolite admin) needs to rmrepo
some user's repo.
