FIX: Topics added on the fly are now sorted alphabetically within the topic list (they still appear at the bottom of the list until an alternate record is edited).
FIX: Added additional indexing to calls database to improve performance.
FIX: Some call records may have been incorrectly purged.
FIX: Calls dialled from an on air device were not marked as having been on air until they were moved off the device and then returned to it.
FIX: Server and client slowdowns under heavy call volume.
