Performance optimisation: - based on analysis of Xdebug cachegrind output.

• 'pgsql' fix.

Note: filter_api really should be updated to use query_bound stuff

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@4717 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9