* Added a 'STATIONS.SSH_IDENTITY_FILE' field to the database.
* Added a 'RECORDINGS.URL_USE_ID_FILE' field to the database.
* Added a 'FEEDS.PURGE_USE_ID_FILE' field to the database.
* Incremented the database version to 333.
* Added 'RDStation::sshIdentityFile()' and
'RDStation::setSshIdentityFile()' methods.
* Added 'RDRecording::urlUseIdFile()' and
'RDRecording::setUrlUseIdFile()' methods.
* Added 'RDFeed::purgeUseIdFile()' and 'RDFeed::setPurgeUseIdFile()'
methods.
* Added a 'SSH Ident. File' control to the 'Host' dialog in
rdadmin(1).
* Added an 'Authenticate with local identity file' checkbox to
the 'Feed' dialog in rdadmin(1).
Signed-off-by: Fred Gleason <fredg@paravelsystems.com>