quick fix (add missing methods after search refactoring)

Just add missing methods:
	/** @DEPRECATED */
	public function setLength( $limit ) {
		return $this->setLimit( $limit );
	}
	/** @DEPRECATED */
	public function setDebug( $param ) {
		return $this;
	}
	/** @DEPRECATED */
	public function setSkipCache( $param ) {
		return $this;
	}
	/** @DEPRECATED */
	public function setRedirs( $param ) {
		return $this;
	}
	/** @DEPRECATED */
	public function setGroupResults( $param ) {
		return $this;
	}