D:D:A:Purger extract _add_timeline_event
D:D:A:Purger extract _destination_dir method
whitespace
D:D:A:Purger extract _purge_unarchived
D:D:A:Purger purge archived allocations
D:D:A:Purger rename _add_timeline_event to _finalize_purge
D:D:A:Purger extract _update_allocation_status
move get_trash_folder functionality to D:Volume
D:Volume have database select trash volume by aggr
D:Allocation::_get_trash_folder returns allocation-specific dir
D:D:A:Purger expand _destination_dir()
D:Volume add clear error when missing trash_volume
Updated class browser cache.
Updated `genome` tab completion.
Merge pull request #54 from mark-burnett/purge-archived-allocations

Purge archived allocations