Rework the actor schema validation

Here is a rework of the async form validating.

• Reworked the following: process calculated, then load data, then warnings and time estimate
• Now even if the data is not valid, calculated and time_estimate are called
• It means some may have to be fixed
• Finally a DEBUG attribute was added to help debugging such form

This fixes the 2 following use cases

• A field is missing -> but calculated was able to feed it
• A field is missing -> but time_estimate do not depend on it