* llx_accounting_system: add missing fields during install
The current code expects to be able to assign an author for the object
and store the creation date.
* Remove constraint
The constraint is useless for the integrity of data of the table and for the business rules using this table, so we must avoid it if we can. This will avoid error when loading dump, errors on import and more...
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Co-authored-by: Laurent Destailleur <eldy@destailleur.fr>