In this commit, several improvements and fixes have been implemented in the 'selfconsumptions' model:

1. Typo correction in code comments for improved clarity.

2. Added explanatory comments to enhance code documentation and understanding.

3. Refactored the codebase to follow the DRY (Don't Repeat Yourself) principle, reducing redundancy and improving maintainability.

4. Eliminated the wizard to initiate the download immediately upon button press, providing a more streamlined user experience.

5. Changed the name of the custom paper format for consistency and clarity.

1. CAU: Add a space between the field name and its value to enhance readability.

2. Table: Remove the coefficient value and leave it blank. Additionally, adjust the height of the fields for improved layout.

3. Remove all other tables, leaving only the self-populating table for simplicity.

4. Update the filename to improve clarity: Change the name of the .txt file.

1. Introduce the ReportWizard model: A transient model, "ReportWizard", has been implemented in
   report_wizard.py. This template represents the wizard popup window and contains
   the content of the report, the name of the file.

2. The wizard view in report_wizard_view.xml: Shows the report content and file name,
   with a button that, when clicked, triggers the "download_report" method
   on the magician model.

3.controllers.py - when the user clicks "Download report"
   of the wizard, go to the URL /self-consumption_energy/report_download.
   This URL is handled by the controller, which takes the helper registration ID from the URL,
   retrieves the report content from the log and responds with content you request
   the browser to download the report as a file.

[MIG] ReportWizard model, wizard view, controller