Do not urlencode anchor in links we output

Do not urlencode anchor in links we output

This fixes non-TOC links in IE5, 5.5, and 6 (didn't test 7) when
$wgEnforceHtmlIds is off.  These browsers won't follow urlencoded
Unicode anchors in href's, they only work if not urlencoded.  Having
non-urlencoded bits in href's should be perfectly fine, correct me if
I'm wrong.

As far as I can tell, Title::escapeFragmentForURL() is never used for
HTTP redirects, if there's any concern about those.  The correct
function to fix those is Article::doRedirect().  My testing indicates
that IE{5,5.5,6} will not accept Unicode anchors in anchors in HTTP
redirects, whether urlencoded or not.