Also put comments about deprecated arguments.

Only shadow user is allowed to access public machine.

Maximum subscription date is closed on the 28.

Max day is 28.

User does not have access to portal_secure_payment.

Only handle relative_url to do get unauthorized.

Tool is provided by erp5 bt5.

Periodicity calculation should only be based on Hosting Subscription
periodicity, and not hardcoded in a script.

Limit as possible number of modifications on open order line.

Subscription start date should be based on beginning of the slap workflow, to
ensure compatibility with old data.