Merged chap_fondements_cubicweb and chap_bases_framework_cubicweb as they were both describing differents aspects of CubicWeb framework.
Replaced original content of mise_en_place_environemment that was by mistake erased and replaced with chap_migration content.
This directory contains extra libraries which are needed
to make cubicweb work.
The mx.DateTime python implementation is directly taken from
the mx.DateTime distribution. The only modification is the
strptime function which has been mocked using the standard
``datetime`` module. (as provided by the python2.5's stdlib)