One provided by super class is overbloated.

This will prevent the global checkConsistency alarm to complaint about those documents

This is simplified version of Computer_updateFromDict, which implements only
what is defined in REST API.

It have to be implemented differently, as bobobase_modification_time does not
reflect the fact that instance is indexed.

Computer might need access to destroyed hosting subscription in order to
update its simulation.

erp5_bearer_token does not store data in ZODB anymore.

instance.getRootSoftwareReleaseUrl returns URL of software release, but ERP5
works on documents.