fix for 0004787: Issue Summary is marked as updated when it contains 'quotes' or "double quotes"
bug_prepare_db acts differently in php5 with respect to passing parameters by reference

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@3211 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9