Remove the ability to delete accounts

Comments out any actual deletions of data for attendees, groups, and
admin accounts. Everything else currently behaves as if the deletions
are completed.
Allow deletion of Unassigned badges

Allows admins to remove "Unassigned" badges, which don't have data. Also
adds support for removing badges from a group where they would normally
be deleted.
Remove syntax error

I missed commenting out an empty for loop.
Add tracking for deletion attempts

AnthroCon wants to know when someone TRIED to delete an attendee, even
though the deletion doesn't go through. This adds manual tracking so it
shows up in the FODC.
Fix group unassigning

Uber was creating a badge with a duplicate number when you unassigned a
badge from a group. Now it just adds an extra badge to the group
instead.
Merge pull request #808 from magfest/change_deletion_to_inactive

Remove the ability to delete accounts