bug#20325: convert "fixes:debbugs:123" in log to (Bug#123) in ChangeLog

[Paul Eggert]

Stefan Monnier wrote:
> I like "fixes: debbugs:123" and see no reason to change it.

Hmm, that's news to me.  Until recently CONTRIBUTE said "Fixes: bug#NNNNN" 
because Eli suggested it 
<http://lists.gnu.org/archive/html/emacs-devel/2014-12/msg00892.html>, and you 
said that it sounded good and that you were also OK with "(bug#NNNNN)" 
<http://lists.gnu.org/archive/html/emacs-devel/2014-12/msg00917.html>.

I don't care what format is used, and it's fine with me to revert my attempt to 
bring order to this little corner of chaos.  Another possibility is to modify 
CONTRIBUTE to add "Fixes: debbugs:NNNNN" and "Fixes: bug#NNNNN" and etc. as 
alternative ways to spell "Bug#NNNNN".  It's no big deal either way.