* Added a 'DROPBOXES.FORCE_TO_MONO' field to the database.
* Incremented the database version to 268.
* 'RDDropbox::forceToMono()' and 'RDDropbox::setForceToMon()' methods
in 'lib/rddropbox.cpp' and 'lib/rddropbox.h'.
* Added a 'Force to Monaural' checkbox to the 'Edit Dropbox' dialog
in rdadmin(1).
* 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'.