[c-c newcube] #1192: simpler cubicweb-ctl newcube, and more * new --layout option, to get 'simple' or 'full' cube * new --licence option to specify license for the cube * added README and sobjects.py template (the later only added in full layout) * fixed python file templates to get proper headers according to the config

"""%(distname)s entity's classes

:organization: %(author)s
:copyright: %(year)s %(author)s
:contact: %(author-web-site)s -- mailto:%(author-email)s
:license: %(long-license)s
"""