* Added a 'SERVICES.LOG_SHELFLIFE_ORIGIN' field to the database.
* Incremented the database version to 275.
* Added a drop-down control to the 'Set Logs to auto-delete' control
to allow origin to be specified in the 'Edit Service' dialog in
rdadmin(1).
* Implemented application of the 'Purge Logs' setting when creating
logs manually.
* Changed the wording of the 'Purge Logs' and 'Purge ELR Data'
control in the Edit Service dialog in rdadmin(1).
* Added 'RDLog::create()' and 'RDLog::remove()' static methods.