pylint #122575 Make Pylint not depend on the logilab* package [open]

Several reasons (in increasing order of importance):

  • logilab.astng really is an implementation detail of pylint
  • logilab.common provides a lot of cruft
  • logilab.common is currently under an unmaintainable rule: its source must be python 2.x (from at least 2.5, maybe 2.4?) compatible and also work without manual change through a 2to3yfication (the purpose is to have pylint work on a wide range of Python versions)
  • when working in some cubicweb virtual env (which needs some of the logilab.* namespace, but definitely not astng), I can't have a working pylint unless I stick astng -- which I should NOT be forced to
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