[8.0] Fix pep8

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.