- The flag is automatically set or unset as appropriate when loading a party, based on the version of the scenario they're in.
- The flag is also automatically set and unset when entering a scenario.
- Commented some probably redundant code in fire_missile()
- Added Map Not Available option (or was that last revision?) for towns
git-svn-id: http://openexile.googlecode.com/svn/trunk@39 4ebdad44-0ea0-11de-aab3-ff745001d230