process doc - note all changes affecting workflow

[Robert Collins]

This is a reminder for me to write up a conversation I had with Martin,
and put it up for discussion.

 affects bzr
 assign lifeless
 status confirmed
 importance wishlist
 done
--

[Martin Pool (mbp)]

Specifically (and so this bug can be understood by others before it is
closed): our process should say: if you're going to change the way
other developers work, eg by making pqm send back subunit, advertise
this first.

--
Martin <http://launchpad.net/~mbp/>