Drop python2 support
This mostly consists in removing the dependency on "six" and updating
the code to use only Python3 idioms.
Notice that we previously used TemporaryDirectory from
cubicweb.devtools.testlib for compatibility with Python2. We now
directly import it from tempfile.
The View system
===============
This chapter aims to describe the concept of a `view` used all along
the development of a web application and how it has been implemented
in |cubicweb|.
.. toctree::
:maxdepth: 3
views
basetemplates
primary
reledit
baseviews
startup
boxes
table
xmlrss
urlpublish
breadcrumbs
idownloadable
wdoc
.. editforms
.. embedding