[dataimport] dispatch and deprecate old code previously, the whole dataimport.py content has been copied in dataimport/__init__.py, then dataimport/importer.py API has been introduced. Following these changes, this cset: * dispatch __init__ code into sub-modules * dispatch unittest_dataimport accordingly * deprecates functions and classes that are deprecated by the new API Related to #5414753.

Data as objects
===============

In this chapter, we will introduce the objects that are used to handle
the logic associated to the data stored in the database.

.. toctree::
   :maxdepth: 1

   data-as-objects
   load-sort
   adapters
   application-logic