Remove ctl commands using the Twisted backend
This backend is not maintained, very likely no longer used in any recent
instance, and not supported in Python 3.
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.