[phobos] Column limits again

[Andrei Alexandrescu]

I must bring this back into discussion because it seems the recent 
traffic in the matter left the impression that "anything goes".

We have a pull request 
(https://github.com/D-Programming-Language/phobos/pull/27) with at least 
one line that is 195 characters long and others of comparable lengths.

I think as far as presenting arguments the ship has sailed. Let's now 
agree on a maximum line length. What should that be? 80? (Yes please.) 
100? 120? Give me your vote for a number, but please let's avoid 
reviewing telex rolls going forward.


Thanks,

Andrei