There is no more need to set an accounting date as the usual date is now used.

add new files
fix pipeline requirements

 : Reviewed migration, play_onchanges usage, and unit tests

in case other modules also install companies.

This would happen when running tests on a DB where ``account_period`` is
already installed.

Follow-up on rev 7bde6eae1dcf.

Upgraded the module version.
Updated the change log.

based on menu items.

Specifics to play better with accounting changes:

* No longer change the base ``date`` field; add ``accounting_date`` instead.
* Build periods when loading accounting data for a new company.

 in tests, copy an existing product rather than creating a new one to avoid problems with new required fields in other modules
and also  remove description from manifest as README.rst will be used automatically instead