[py3] Let InstanceCommand.run_arg() always return an int The caller of this method (which is method "run_args") does `max(status, self.run_arg(appid))` and run_arg might return None if the underlying <cmdname>_instance method returns None. On python3 max(1, None) breaks with "TypeError: unorderable types: int() > NoneType()". So we enforce run_arg() method to return an integer even if the underlying method returns None. This fixes call of "cubicweb-ctl i18ninstance" with Python3.

3.26 (1 February 2018)
======================

New features
------------

* For ``pyramid`` instance configuration kind, logging is not handled anymore
  by CubicWeb but should be configured through ``development.ini`` file
  following https://docs.pylonsproject.org/projects/pyramid/en/latest/narr/logging.html.

Backwards incompatible changes
------------------------------

* CubicWebConfiguration method 'shared_dir' got dropped.