new cvs module: niwi

I liked Charlie's suggestion on the naming here (NItrogen WIdgets).
Nitrogen breaks enough stuff that we have to go through the widgets
one by one and make sure they work.

So I've created a new CVS module (cvs co niwi).  Only check stuff in
that's confirmed to work with Nitrogen (I'll have a usable test
version out in a few days).  Please adhere to

  http://wiki.xwt.org/Wiki.jsp?page=PNGWA

And only check in templates that are described on that page (plus
individual themes).

I'll throw a few widgets in there to show how it's done.

  - a

-- 
"Education is not filling a bucket but lighting a fire." -- WB Yeats