1) when autosummaries are mixed with human-written ones, insert separators

1) when autosummaries are mixed with human-written ones, insert separators
where needed
2) allow links in summaries, but no other wiki formatting (if this is too
slow, we can switch to makeKnownLink, which does not need to look up if
the page exists). The regexing here is a bit ugly, if someone can simplify
it, please do so. I had problems when using something like
preg_replace(regex,$this->makeLink("$1")), where it would apparently not
fully resolve the $1 and end up mixing the resolved back reference with
the string $1, so you would get links like <a href='$1'>Page title</a>.
Weird stuff.
3) use Skin::formatComment in Special:Newpages
4) preliminary accesskeys for toolbar, but not used yet (works wonderful
in Mozilla, but in IE, it just focuses the buttons - maybe make it a user
pref when prefs are reorganized, or make it work in IE)