Includes DB changes, you need to log all terminals out during upgrade

Couple of serious bug fixes with 5.2.21

• c9 would crash on various circumstances because of pack qty changes such as selling parts to workshop. (couple of db stored procs not updated to handle packs, such as part kit update )
• NullPointerException on unit sell. tradein or purchase fine, only sell broken (newly added code to lock db records before update broken).