We clean various graph archs taking into consideration that:
- the default type of a graph is "bar".
- a bar chart is by default stacked.
- the field attributes type="row" and type="col" does not make sense for
a graph view (since its implementation was separated from the pivot
implementation a long time ago))
- the boolean attributes should now take 1 or 0 as value (but the other
values are accepted for retrocompatibility).
Part-of: odoo/odoo#76065
Mathieu Duckerts-Antoine
7545913020