Remove tree structure from company

issue10163
review332181002

tests/scenario_sale_price_list.rst

@@ -31,7 +31,6 @@ Create sale user::
     >>> sale_user = User()
     >>> sale_user.name = 'Sale'
     >>> sale_user.login = 'sale'
-    >>> sale_user.main_company = company
     >>> sale_group, = Group.find([('name', '=', 'Sales')])
     >>> sale_user.groups.append(sale_group)
     >>> sale_user.save()
@@ -39,7 +38,6 @@ Create sale user::
     >>> sale_admin = User()
     >>> sale_admin.name = 'Sale Admin'
     >>> sale_admin.login = 'sale_admin'
-    >>> sale_admin.main_company = company
     >>> sale_admin_group, = Group.find([('name', '=', 'Sales Administrator')])
     >>> sale_admin.groups.append(sale_admin_group)
     >>> product_admin_group, = Group.find(