Improve the schema command with filtering option.
meta data and workflow data are hidden by default. show-meta and show-workflow
option are added to display them. Another "hide-type" option allow to hide
additional entities type.
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)