4878: filter_get_bug_rows() does not take project_id and user_id

The filter_get_bug_rows() was using other APIs which used current project and current user. It also had a lot of calls to APIs while not specifying the project id or user id (hence they user the default as well). Also a lot of currentuser were replaced by user_.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@3111 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9