Touch up Title::get[Full|Local]URL. This concept of "if not an existing interwiki...

Touch up Title::get[Full|Local]URL. This concept of "if not an existing interwiki getFullURL calls getLocalURL" and "if external (interwiki) getLocalURL calls getFullURL" is ridiculous. In fact if mInterwiki just happens to not be '' and not exist, you create infinite recursion and php dies.
Instead of having getFullURL and getLocalURL call each other, move the interwiki workload into getLocalURL, and make getFullURL simply call getLocalURL then expand it (use the wf method in case it's already a full url) and append the fragment to it.