* create string representation of an attribute list
*
* <code>
* require_once 'XML/Util.php';
*
* // build an attribute string
* $att = array(
* "foo" => "bar",
* "argh" => "tomato"
* );
*
* $attList = XML_Util::attributesToString($att);
* </code>
*
* @access public
* @static
* @param array $attributes attribute array
* @param boolean|array $sort sort attribute list alphabetically, may also be an assoc array containing the keys 'sort', 'multiline', 'indent', 'linebreak' and 'entities'
* @param boolean $multiline use linebreaks, if more than one attribute is given
* @param string $indent string used for indentation of multiline attributes
* @param string $linebreak string used for linebreaks of multiline attributes
* @param integer $entities setting for entities in attribute values (one of XML_UTIL_ENTITIES_NONE, XML_UTIL_ENTITIES_XML, XML_UTIL_ENTITIES_XML_REQUIRED, XML_UTIL_ENTITIES_HTML)
* @return string string representation of the attributes
* @uses XML_Util::replaceEntities() to replace XML entities in attribute values