Allow command line management of edit_log entries

[azaroth42]

There doesn't appear to be a way to manipulate the edit_log list of record changes. However when an instance of Arches is cleared of all its records, it would be good to be able to also zero out the edit_log.

In particular, a CLI utility that just called DELETE FROM edit_log; would seem to suffice? A flag on the remove_resources operation would also be valuable to do it in one step.