logilab-common #696369 packaging breaks some older logilab's subpackages [validation pending]

on a machine with recent (1.0.X) logilab-common packages installed, the mkdoc common from logilab-doctools stopped working. This seems due to the content of the logilab/__init__.py file which is now empty, forbidding discover of logilab.doctools which is still installed in pymodules.

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