C2/ Implementation delivered_energy_invoice_format

This reverts commit af6df440.

Rebase error.

This reverts commit d0d2f2f2.

Rebase error

In this commit we finish defining how to handle the different templates using the _get_name_invoice_report() method to tell the action the name of the template to use.

To replace the initial idea, I am thinking of adding a new item to the "print" button that allows access to a new energy delivery report.

At this point I am not being able to get the action to work correctly.