6Feb/092
How to do SUM with Propel
http://www.digitalbase.eu/blog/simplifying-queries-using-sum-count-etc-in-propel/
$c->addSelectColumn('sum('.dbTimeBlockPeer::TOTAL.') as total');
$rs = dbTimeBlockPeer::doSelectRS($c);
while ($rs->next()) { $total = $rs->getInt(1); }