Patch query - single email per bug

[Gervase Markham]

J. Paul Reed wrote:
> If you can resolve the fact that you'd have to send email to classes of
> people (owner, all CC list, etc.), then it should be an acceptable
> optimization.

What about insidergroup? If a comment is marked as insidergroup, and 
other changes are made at the same time, half the CC list need one email 
and half need the other.

It might be possible to write a patch which works out all the possible 
parameters for an email, and amalgamates any which have exactly the same 
parameters - but there's a danger of it breaking every time email gets 
more customisable.

Gerv