[rtags] Allow to 'derive' rtags Since some releases, rtags (structure underlying uicfg) have selector and may be copied using something like: new_rtags = deepcopy(original_rtags) new_rtags.__module__ = __name__ new_rtags.__select__ = custom_selector The problem is that starting from that, both rtags wil diverge and changes in original_rtags won't be considered, while we usually want to set a few specific rules only in new_rtags. To fix this problem, this cset introduces the notion of "derivated/parent" rtag, eg: new_rtags = original_rtags.derive(__name__, custom_selector) Beside easier copying, when using the above method changes in original_rtags which are not overriden by new_rtags will be considered since it only hold its specific rules but look among its parent chain for non-found keys. Along the way, flake8 unittest_rtags. Closes #16164880

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[tox]

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envlist = py27,py34,flake8

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[testenv]

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sitepackages = true

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deps =

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  pytest

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commands =

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  {envpython} -m pytest {posargs:test}

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[testenv:flake8]

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skip_install = true

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whitelist_externals =

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  flake8

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deps =

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  flake8

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commands = flake8

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[flake8]

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exclude = cubicweb_%(cubename)s/migration/*,test/data/*,.tox/*