Admiral MS' AI flag to enable the AI to be smarter when using afterburners. flag name is "free-afterburner-use". See http://www.hard-light.net/forums/index.php?topic=83818.0 for reference

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9795 387891d4-d844-0410-90c0-e4c51a9137d3