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
3.26 (1 February 2018)
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New features
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* 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
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* CubicWebConfiguration method 'shared_dir' got dropped.