* Added 'FEEDS.CHANNEL_IMAGE_ID_IDX', 'FEEDS.DEFAULT_ITEM_IMAGE_ID_IDX'
and 'PODCASTS.ITEM_IMAGE_ID_IDX' indexes to the database.
* Incremented the database version to 337.
* Added a sanity check to the 'Image Manager' dialog in
rdadmin(1) to prevent deletion of in-use images.
Signed-off-by: Fred Gleason <fredg@paravelsystems.com>