New PBIs: OpenTTD and Amanda

The following PBIs are now available through Software Manager:

OpenTTD: a clone of Transport Tycoon Deluxe, a popular Microprose game originally written by Chris Sawyer. It attempts to mimic the original game as closely as possible while extending it with new features.

Amanda: a backup system designed to archive many computers on a network to a single large-capacity tape drive.

Thanks to Jesse Smith for creating these PBIs.