Chris Morris 603a934fa8 Add interfaces for cargo and passenger contracts. Including:
- API to allow OXPs to insert contracts
 - New customsounds entries for contract acceptance and rejection
 - New choicesKey parameter to make choice unselectable
 - More than 5 contracts viewable at once


git-svn-id: http://svn.berlios.de/svnroot/repos/oolite-linux/trunk@5466 127b21dd-08f5-0310-b4b7-95ae10353056
2012-11-01 20:36:08 +00:00
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