Fixes bug in user deactivation.
And another fix to mailman deactivation.
Remove a silly thing and a print statement in mailman.lists_containing.
Fix the previous fix, and make mailman not send remove notifications

They might really just be having their email changed, and that would be confusing.
Merge pull request #1274 from learning-unlimited/mailman-deactivate-fixes

Mailman deactivate fixes