remove php short tag
do not declare $var_meta while checking if var default should be editable, because it can be nested and so bring to not-existing $var_meta when doing $this->print_var(). Current realization makes double get_var_meta() call sometimes, maybe we should fix it later
support of with-each + separator att:
<div fx:with-each="$tags" fx:separator=", ">
   <a fx:item>{$name}</a>
</div>