Fixing trac issues

Just wanted to make a note of how the trac issues with cmucl were fixed,
for future reference. These issues showed up in cmucl's git
post-receive-hook.

First, the permission on /project/cmucl/trac/log/trac.log was incorrect.
It needed to be writable by the group cmucl. I think Erik has fixed this
so this won't be a problem in the future (by changing trac's umask to 002).

Second, the trac.db (/project/cmucl/trac/db/trac.db) also needed to be
writable by cmucl.

With these changes, trac works beautifully again.

Many thanks to Erik for his help in fixing this.

--
Ray