D:Allocation directly delete archived allocations
D:A extract _delete_timeline_events
D:A delete timeline events when deleting archived allocation
whitespace
D:A delete archive inside commit observer
D:A move duplicate lines out of if/else
D:A extract get_deletion_observers
D:A bugfix - invalid test syntax
D:A bugfix - test whether $directory is a dir

`-a` seems to test whether it's a file or directory, which does not seem
to be the intent.
D:A notify of failure when `rm` from tape fails
Merge pull request #39 from mark-burnett/delete-archived-allocation

Allow archived disk allocations to be deleted directly from tape
Merge pull request #44 from mark-burnett/fix-cleanup-archive-directory

Fix G:D:A _cleanup_archive_directory