This commit does below improvements:
1/ If salesperson and sales team are set on an individual partner, we propagate
those to parent company being created from m2o of the form view.
2/ If the existing parent company is manually linked to an individual partner
being created, and salesperson and sales team are not set on the individual,
we set those values from the linked parent (if set on the parent).
Task-2636290
closesodoo/odoo#78696
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>