• admin/upgrades/0_17_inc.php: add upgrades to remove the zerofill on all
  the database columns and also to remove defaults from columns that cannot
  logically be unset when rows are created.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1866 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9