[8.0] Fix pep8

On 07/24/2014 01:53 PM, Sandy wrote:
>
> On the mailing list last year.
> https://lists.launchpad.net/openerp-community/msg03986.html
>
> I put 120 so we wouldn't ignore line length entirely, and now it is at 
> least uniformly checked everywhere in OCA (no style splintering).
>
> If we want to have the dicussion again and we come to a conclusion 
> that the line length is, say 100 (suggested in pep8 
> <http://dinsdale.python.org/dev/peps/pep-0008/#maximum-line-length>) 
> we have a constructive way of enforcing it.
>

If I remember correctly, on that occasion the majority said 79