[devtools] Update skeleton's setup.py to install cube as a package Most of the prior logic of skeleton's setup.py gets dropped as installing a cube as a "classic package" (i.e. in site-packages) is just the default behavior of distutils. Also add a test checking installation of new cube. Related to #13001466.

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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