[doc] enhanced setup section: fix sections'level, more postgres tips, merge environment doc with cwconfig.py module docstring using custom autodocstring directive
"""this contains the cube-specific entities' classes
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""