Quote keys in optional SQL clauses (Issue #408)

			$sql.=' WHERE '.$filter;

		}

		if ($options['group'])

			$sql.=' GROUP BY '.$options['group'];

		if ($options['order'])

			$sql.=' ORDER BY '.$options['order'];

			$sql.=' GROUP BY '.implode(',',array_map(

				array($this->db,'quotekey'),

				explode(',',$options['group'])));

		if ($options['order']) {

			$db=$this->db;

			$sql.=' ORDER BY '.implode(',',array_map(

				function($str) use($db) {

					return preg_match('/(\w+)(?:\h+(ASC|DESC))?/i',

						$str,$parts)?

						($db->quotekey($parts[1]).

						(isset($parts[2])?(' '.$parts[2]):'')):'';

				},

				explode(',',$options['order'])));

		}

		if ($options['limit'])

			$sql.=' LIMIT '.$options['limit'];

			$sql.=' LIMIT '.(int)$options['limit'];

		if ($options['offset'])

			$sql.=' OFFSET '.$options['offset'];

			$sql.=' OFFSET '.(int)$options['offset'];

		$result=$this->db->exec($sql.';',$args,$ttl);

		$out=array();

		foreach ($result as &$row) {