bug#17643: 24.3; Please remove comma bindings from french-prefix

[Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>]

>> Because of this binding, typing a single comma requires typing ", SPC",
>> which means that the common combination "comma space" requires typing
>> ", SPC SPC".
>
> I think the problem is not in binding , to cedilla, but in binding 
> ", SPC" to just a comma.  How 'bout the patch below instead?

> - (", " ?,)
> + (",," ?,)

It's usable now, but still annoying, since commas get underlined as
you type, which I find distracting.  But perhaps it's a simple matter
of habit -- I'm much more tolerant of apostrophes getting underlined.

Stefan, cedilla is not that common in French, so I think that keeping
it out of the way on "~" is the reasonable thing to do.  Additionally,
it's consistent with latin-prefix and latin-9-prefix.

-- Juliusz (who really likes the polish-slash input method, and who
            likes to claim he's the one who invented it)