dfwiki requests

• Add templates so that some content can be made available to all groups when they start using a wiki

• Create a more user friendly (WYSIWYG) view for the history/diff mode. Something similar to what was available in the "old" wiki would be enough, but I'm sure you guys can make it even better :-}. Actually, I just saw the view for the diff format in this wiki (the one where MoodleDOCS are created) and it does just what I want. That's the kind of interface that would be nice to add to dfwiki.