Patch: allow query strings (?param=value) in taxonomy menu paths

Taxonomy Menu 6-2.3 does not save paths that have query strings in them, because _taxonomy_menu_save() does not look for a query string.

This patch adds that check (strpos() for '?') and sets $item['options']['query'] and $item['link_path'] accordingly if it does find one. With those values present menu_link_save() will properly save the menu item with the query string.

In my use case, this patch allowed me to write a custom module that implements hook_taxonomy_menu_path() and creates paths that use query string.