[FIX] account.invoice.line: move context to last position in onchange methods

The methods product_id_change() and uos_id_change() have been converted to the
new api, and now use the decorator @multi.  When invoked with the old api, by
convention the methods will take the last argument as the context.  But this
will not work properly for those methods, as the context is passed in another
position.  In order to avoid an argument swap in the api wrapper, we moved the
context to its expected position.

Fixes #1943
[FIX] base: ir.model.data.name_get() respect expected behavior.

name_get() must return a value for each ids and keep order of ids.
[FIX] fields.py: One2many fields only set inverse field on Many2one fields
[FIX] web_calendar: calendar title and column according to l10n
[IMP] product : Improve tooltip of pricelist on min_quantity field.
[FIX] Report: search associated qweb views: do not forward context

The context may be inconsistent (for instance, containing a group_by associated to another
model). The client will take care of keeping it consistent. Fixes issue #1768
[IMP] product: Order product.template by name

When no order is forced, it's more user-friendly if the products are ordered by alphabetical order.
This will mainly be applied:
* In the list view in the back-end
* In the eCommerce, for products with equal website_sequence
[FIX] point_of_sale: display an error when trying to print a receipt on an outdated posbox
[FIX] website_sale: typo in tour
[IMP] crm: Use cookies to save utm instead of session.
Merge branch '8.0' into develop