1. Added history_log_event_direct() that can history entry without access bug or user tables.
2. Added get_bug_row() which returns all mantis_bug_table fields given the bug id.
3. Added get_bug_row_ex() which returns all mantis_bug_table fields + mantis_bug_text_table fields.
   (handler and reporter names will be added in the future, for not-assigned bugs the handler should be
   null).
4. Optimised bug_update.php, it now executed a couple of queries rather than
   over 50 before.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1131 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9