process_bug.cgi as backend and dontchange

[Gervase Markham]

Christian Reis wrote:

> This hack is better than one that defines a policy for process_bug.cgi
> of "if value == value of dontchange" ignore it? It would make things
> simpler to understand..

Your scheme is probably better; but it requires Bugzilla mods and so 
isn't compatible with older Bugzillas. I don't know if you care about 
that too much.

Also, remember that the dontchange string could, however unlikely-ly, be 
set to the same name as a defined Product, because it's just localised text.

Gerv