[IMP] fields: log when a stored field depends on a non-stored field
[IMP] fields: log when a stored field depends on a non-stored field

Log an info when a field is computed and stored, but not all its dependencies
are stored.  Also allow to set explicitly `depends` on a field; this is useful
to restrict the dependencies of a related field.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo