URL Fragments not handled correctly by extern/url.php

CRM-7103 introduced a bug with fragment handling.

By blindly appending & or ? to the end of the url, those url's with fragments were rendering as:
http://domain.com#fragment?

...and some browsers would then look for a named anchor called "fragment?" and not "fragment" - I have attached a patch to handle putting fragments always at the end, and only appending ? or & if there is such a query string to be appended after shifting off "u" and "qid"

I make use of parse_url, which is PHP5 - but I think that's OK... ?