[py3] Use "utf-8" as input encoding for docutils in rest extension Docutils says that "unicode" is an unknown encoding on Python3. Not sure where "unicode" as an encoding comes (it's there since showtime) but "utf-8" seems more appropriate. From now on, rendering of CubicWeb's rst directive (e.g. ..winclude) works on Python 3. Accordingly, we extend wdoc's test to demonstrate this. For this we need to install docutils in tox's web environment.

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/*