related to Mantis #3121, add parentheses if the string passed to runSEXP doesn't have them

git-svn-id: svn://svn.icculus.org/fs2open@11110 387891d4-d844-0410-90c0-e4c51a9137d3
remove unused debug function

git-svn-id: svn://svn.icculus.org/fs2open@11111 387891d4-d844-0410-90c0-e4c51a9137d3