Add dbclean*() functions to abstract the variable cleaning process so it's obvious that's what is happening and easy to change globally later.

Will start using these during the addslashes() cleanup or during the major security overhaul, whatever proves easier.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1264 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9