* Added a 'STATIONS.JACK_PORT' field to the database.
* Incremented the database version to 287.
* Added an 'Initial Audio Ports' control to the 'JACK Configuration'
dialog in rdadmin(1).
* Implemented 'Activate JACK Port' ['JA'] and 'Remove JACK Port' ['JR']
RMLs.
* Added a sanity check to rddbmgr(8) to prevent reverting from an
unknown schema.
* Added a sanity check to rddbmgr(8) to prevent inadvertent
reversion to an implied schema.
* Stubbed out rddbmgr(8).
* Implemented the '--create' command in rddbmgr(8).
* Fixed a bug in 'RDStation::create()' that generated corrupt records
in the 'AUDIO_INPUT' and 'AUDIO_OUTPUTS' tables when creating a
new host with no exemplar.