[MERGE] improvements/fixes of yaml_import for a more realistic creation of record (as if it was done by a form view)
* Upon creation of records in yaml, the view to use for the one2many fields should be the one define in-line in the record form view (if any)
* Now raises an error if an onchange call returns a field that is not in the view (because computing something that is of no use is probably not expected: the onchange OR the view should be fixed/improved)
* Improve performances by reducing the number of fields_view_get() and fields_get() call
* code refactoring