[cubicweb-ctl] backport --loglevel option of pyramid to all instance commands

[cubicweb-ctl/fix] correctly get exception traceback_ for pdb.post_mortem In python 3 the behavior of sys.exc_info had a very subtle change: - in python 2 you can call if whenever you want after a try/except statement and you'll get information about this last raise - ipython 3, once you get out of try/except, sys.exc_info is cleaned and you'll get (None, None, None) Hardened the test to avoid this error from happening again.

Document mercurial configuration for contributing * how to use master/review repositories * how to send the "Available at" command in patchbomb emails * how to add the "cubicweb" flag in patchbomb emails * how to use our "jenkins" mercurial extension Closes #17243538

Add documentation on workflow permission

Remove undefined function in documentation

Merge 3.26

[pyramid/ctl] pyramid command will always run in foreground from now on Daemonization used to make sens in the past, but today "pyramid" command is only used for dev and should never be used for deployement (you should use a wsgi server for that instead) so daemonization doesn't fit any use case anymore. Closes #17232923

[clean] remove pyramid warning about looping task This warning isn't useful anymore.

[doc] add instruction to re-enable ckeditor

[fix] reference to underclared and unused variable kwargs