Because ALT-GR fires a CTRL-ALT event on Windows systems, but ALT-GR is
needed to write square brackets on German Keyboards, CTRL-ALT can not be
used as modifier.

This patch introdues OS dependent modifiers. Mac systems continue to use
CTRL-ALT, all other systems use only ALT.

Let's hope this works out.

The keydown event can't be prevented in Opera (see
http://www.quirksmode.org/dom/events/keys.html) so this switches back to
keypress in Opera (keypress doesn't give the correct key codes in
Firefox). Furthermore Opera replaces '\n' by '\r\n' when inserting text,
thus the offset for cursor/selection placement was wrong.

on the supplied namespace.

besides via Save or Preview button. This has been successfully tested in FF,
Chrome and IE6/7/8. Opera does not support onbeforeunload, therefore the draft
is kept if the user navigates away from the editor.

Please test this.

FS#1874: removed padding for interwiki links in print stylesheet, as the icons aren't displayed there

Tests and feedbacks please!

This patch changes the ft_pageLookup function to always return the
title of pages with the result. This makes it easier to work with the
array, as it no longer changes between numeric and key indexes depending
on useheading.
This also means that action plugins subscribed to
SEARCH_QUERY_PAGELOOKUP need to be adjusted. The event contains a new
data field called 'has_titles' which plugins can use to check for
backwards compatibility.

This patch also removes legacy support for @USER@. Only %USER% is valid
now.