BUGZILLA: Default no auto-mail for CC: changes

[Kelley Cook]

Bugzilla defaults to sending status updates to anyone listed on the CC 
list for ANY change

This is especially bad for the account "gcc-bugs@gcc.gnu.org", which is 
now basically getting spammed by Bugzilla from any minute change to any 
bug.  You probably should turn off most of those automailings for that 
address.

And I think everyone by default should have "email me on a 'CC:' change" 
turned off.  If for some reason, somebody actually would want to know if 
someone added their name to the bug, that particular person could always 
go into their preferences and turn the option back on.

Kelley Cook