* Changed the result code of the 'AddCart' service when the cart
already exists from '403' to '400'.
* Changed the result code of the 'EditCart' service when attempting
to set a forced length on a macro cart from '403' to '400'.
* Changed the result code of the 'EditCart' service when attempting
to set a forced length outside of the valid range from '403' to '400'.
* Changed the result code of the 'Export' service when attempting
to export from a cut with no audio content from '403' to '404'.
* Changed the '401' result code of the 'EditCart' service to be 403.
* Changed the '401' result code of the 'DeleteAudio' service to be 403.
* Changed the '401' result code of the 'Export' service to be 403.
* Added an entry for the Broadcast Tools SRC-16 in
'docs/SWITCHERS.txt'.
* Added a 'CUT_EVENTS' table to the database.
* Added a 'DECK_EVENTS' table to the database.
* Incremented the database version to 256.
* Implemented a 'Cut Event' ['CE'] RML.
* Added a 'Event Carts' section to the Edit Deck dialog in
'rdadmin/edit_deck.cpp' and 'rdadmin/edit_deck.h'.
