Random comments about new plan
More tweaking to async code
No sense it sending notification if the db is down
Mild TODO cleanup
Rename the somewhat confusing bucardo version configuration variables.
bucardo_version becomes bucardo_initial_version
bucardo_current_version becomes bucardo_version
Prevent uninitialized warnings from no db.service on validate, per mailing list complaint.
Make sure we only update bucardo_truncate_trigger if we really need to, per report of severe bloat on the mailing list.
Don't try to use pg_cancel if things blew up, simply rollback and set async_active off!
Print the last git commit information on startup