[1769972] Better handling of rogue markers.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1985 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on August 9, 2007
7UQJTYJTHTDW55ZUKG4TINZTNALGPK5CB7UB7PJ2Y2SKQ5XOYP5AC
Change contents