a few new user_api functions and associated current_user_api wrappers
current_user_api function to get the current filter rules, this seems like a good place to put it so we can get the settings from a db or session in the future - it seems like a user preference generally

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1455 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9