[entity] Add a cw_related_rqlst method returning the RQL select node of cw_related method This is useful if one wants to modify the query before execution. A bit a PEP8 style fix in tests along the way. Related to #12306543.

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etc/init.d

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etc/cubicweb.d

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etc/bash_completion.d

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usr/bin

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usr/share/doc/cubicweb-ctl

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var/log/cubicweb

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var/lib/cubicweb/backup

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var/lib/cubicweb/instances