[cwconfig] create a virtual "cubes" package _CubesImporter now handle import of "cubes" and return a virtual module so that "cubes" is always importable without having to create a __init__.py in CUBES_DIR and add CUBES_DIR/.. to sys.path. Drop custom code in setup.py used to create CUBES_DIR/__init__.py and drop now useless warning when cubicweb is installed in develop mode Update test_cubes_path() and ensure 'cubes.file' is not loaded before testing its import. This test seems to have mistakes because cubes are loaded automatically when discovering cw commands (cubes.<x>.ccplugin), not sure how this should be fixed definitely.

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### Requirements for tests in various cubicweb/**/test directories. ###

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## shared by several test folders

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cubicweb-card

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docutils

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Twisted < 16.0.0

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webtest

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## cubicweb/test

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Pygments

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mock

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#fyzz XXX pip install fails

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cubicweb-file

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cubicweb-localperms

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cubicweb-tag

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## cubicweb/devtools/test

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flake8

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## cubicweb/hooks/test

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psycopg2

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## cubicweb/pyramid/test

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pyramid >= 1.5.0

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waitress >= 0.8.9

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wsgicors >= 0.3

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pyramid_multiauth

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## cubicweb/sobject/test

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cubicweb-comment