Compacting the Bacula catalog

Just compacted the Bacula catalog, which we keep in MySQL, as the partition it was on was starting to run out of space. (Seriously, 40 GB isn't enough?)

First thing I tried was running "optimize table" on the File table; that saved me 3 GB and took about 15 minutes. After that, I ran mysqldump and reloaded the db; that saved me another 300 MB and took closer to 30 minutes. Lesson: "optimize table" does just fine.