public function mergeSection($sectionSource, $sectionTarget)
    {
        if (!isset($this->content[$sectionTarget])) {
            return $this->renameSection($sectionSource, $sectionTarget);
        }

        if (!isset($this->content[$sectionSource])) {
            return false;
        }
        $this->mergeValues($this->content[$sectionSource], $sectionTarget);
        if ($sectionSource == '0') {
            $this->content[$sectionSource] = array();
        } else {
            unset($this->content[$sectionSource]);
        }
        $this->modified = true;

        return true;
    }