[entities] cw_rest_attr_info() should only consider required attributes (closes #3766717)
This prevents CW from choosing unique but non-required attributes. None/NULL is
a poor choice for RESTful URIs.
.. _Part2:
----------------------
Repository development
----------------------
This part is about developing applications with the *CubicWeb*
framework. It is not concerned with the web system, which is a
separate layer and has its own whole chapter.
.. toctree::
:maxdepth: 2
:numbered:
cubes/index
vreg.rst
datamodel/index
entityclasses/index
devcore/index
repo/index
testing.rst
migration.rst
profiling.rst
fti.rst