* Changed the 'RDAIRPLAY_EXIT_PASSWORD' field from 'varchar(41)'
to 'varchar(48)'.
* Incremented the database version to 349.
* Renamed the 'RDSha1Hash()' function to 'RDSha1HashFile()'.
* Added 'RDSha1HashPassword()' function in 'lib/rdhash.[cpp|h]'.
* Added 'RDSha1HashCheckPassword()' function in 'lib/rdhash.[cpp|h]'.
* Changed the hashing algorithm used for the Exit Password for
rdairplay(1) to salted SHA1.
Signed-off-by: Fred Gleason <fredg@paravelsystems.com>