cubicweb #17254012 Allow to set version from vcs and stop expect it from __pkginfo__ [open]
Using https://pypi.org/project/setuptools-scm/ allow to manage version from mercurial tags and allow to work with intermediate versions.
cubicweb currently read cubes versions from __pkginfo__.py, to make this work it should read them from pkg_resources API instead.
Also we must check that migration system doesn't break with intermediate versions like "X.Y.Z.devP+hgHASH"
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