[FIX] stock: multicompany warehouse creation

When creating a new warehouse, the linked locations should have the same company as the warehouse.
The company_id field is required on warehouse (not necessary in vals as could be added by default values) while it is not for stock.location (meaning global location, also filled with default value).
[FIX] report_webkit: re-enable test, disabled during new API developement

Requires an extra use_global_header to be added on
the report record, to mimic the super.create()
behavior, as super.create() is not called.
[FIX] website: do not bind do_customize to menu without data-action
[FIX] website_forum: moved editor-related js files into the editor asset
Merge branch '8.0' of https://github.com/odoo/odoo into 8.0-linux64