[development] CVS HEAD, code freeze, zeitgeist

[Moshe Weitzman]

   we should probably document this on the
> "updating your modules" handbook pages as a best practice, with a short 
> explanation about why it's a bad idea to start porting to HEAD while 
> it's still a moving target.

thats a personal preference. there is no benefit to us encouraging or 
discouraging module developers from working with HEAD. the more people work 
with HEAD the more polished it is when code freeze arrives. it is fine to 
educate module developers, but i would not use the term 'best practice'.