1. Added configuration options which allow control on who should be notified on different actions/events.
2. Added checking for obsolete variables (before of enhancement 1), if found, an error is reported directing the admin to the new configuration variables.
3. Added a database API that allows checking whether a field name exists or not.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1162 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9