[Twisted-Python] Change to ticket workflow

[exarkun at twistedmatrix.com]

Hi all,

Last weekend I changed the default owner for all components in the issue 
tracker to be nobody.  I also installed the "DefaultCC" plugin which 
lets us configure a list of users to be added to the cc list of tickets 
on a per-component basis.

The motivation for this change is basically the fact that when people 
see a ticket with an owner, they think that owner is either working on 
the ticket or will be upset if someone else starts working on it.  This 
has really never been the case with Twisted's development process.

Beyond this change, I think it may also be a good idea to remove owners 
from most old tickets as well.  This will probably happen sometime in 
the coming week, so don't be surprised when you look at your ticket list 
and find it empty.

After this, if you actually want to work on a ticket, there's no reason 
not to assign it to yourself.  The goal here is just to eliminate 
accidental/careless ownership.

Jean-Paul