[NTG-context] wiki update

[Patrick Gundlach]

Hello again,

> I'll update the wiki software in a few hours and editing will be
> disabled for that time. No need to worry!

OK, back to normal, the wiki is updated. I hope no data is lost and
all extensions I've put in are still working as they are expected.
(btw: the sandbox is updated as well).

Patrick
(with fingers crossed)
-- 
ConTeXt wiki and more: http://contextgarden.net