* Added an 'RDApplication::ExitCode'.
* Implemented 'RDApplication::ExitCode' in rdimport(1).
* Implemented 'RDApplication::ExitCode' in rdlogmanager(1).
* Implemented 'RDApplication::ExitCode' in rdservice(8).
Signed-off-by: Fred Gleason <fredg@paravelsystems.com>