[cleanup] Fix some flake8 errors
and drop upper bound of copyright along the way.
autoform module is not added to flake8-ok-files since there are some remaining
errors to be handled, but that's still a start.
Document: cubicweb-doc
Title: CubicWeb Documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/python-cubicweb-documentation/html/index.html
Files: /usr/share/doc/python-cubicweb-documentation/html/*