make support ship deployment more robust, and prevent an edge case where too many support ships could be in the mission at one time

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10000 387891d4-d844-0410-90c0-e4c51a9137d3
fix somebody's spelling

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10001 387891d4-d844-0410-90c0-e4c51a9137d3
oh come on

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10002 387891d4-d844-0410-90c0-e4c51a9137d3
fail

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10003 387891d4-d844-0410-90c0-e4c51a9137d3