[doc] Do not rely on lgc's sphinx_ext This module is broken (getting an ImportError) and I don't want to fix it. The only usage we make of it is for the "autodocstring" directive, and I don't know what it does. Based on the context, replacing autodocstring with either automodule or autoclass and removing sphinx_ext from required Sphinx extensions.

[bdist_wheel]
universal = 1

[check-manifest]
ignore =
  debian
  debian/*
  cubicweb.spec
  __pkginfo__.py