[phobos] Column limits again

[Jonathan M Davis]

> 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.

120, but even 100 would be a _big_ improvement over 80 (_especially_ if it's a 
hard limit). 80 is just too small if you have much indenting.

- Jonathan M Davis