Revert "[ADD] purchase: average price computation test"

This reverts commit 5f9280e854ac435bdcf903128d5e9d5d0b592070.

These tests have been introduced in 7.0/saas-3, but can no longer be applied in 8.0, as they uses models that do not exist anymore in the new wms.

if such tests do not exist yet in Odoo 8.0, then these tests needs re-work, they cannot be applied like that

Conflicts:
	addons/purchase/tests/test_average_price.py
[FIX] res.currency: correctly compute the number of decimal places for currencies formatting in 'get_format_currencies_js_function'.
[FIX] translate: allow common english 2 chars terms

Before, all isolated (between xml/html tags) two chars words coming from views were not translated (by choice).
But, for some words, allowing them is useful. For instance, the word 'or' located between two buttons.

opw-616716
[FIX] sale: rounded sales team invoiced gauge

The price_total field of the account invoice report is not rounded (it cannot be easily rounded, as this has to be done in the sql view)
In a multi currencies environment, this is possible that the price_total value has a lot of digits
We therefore round it manually, for the gauge of the sales team kanban view
[FIX] Use _unknown model for missing models in relation fields

During a migration of database, it is possible that some custom field
("x_", state is 'manual') are relational to model from a module that is
not provided.

Note: this used to work in Odoo 7.0 but crashed in 8.0.

Closes #3877
[FIX] purchase: remove redundancy in report

The warehouse name and address name is often the same (name of the company).
Remove the name of the address as two warehouse may use the same address.
Fixes #4062
[FIX] sale_stock: product_id_change_with_wh on sale order popup too

product_id_change_with_wh onchange was not anymore called when using the popup form in sale order line.

The behavior was different concerning the product onchange when being in the editable list or in the popup form
For instance, for make to stock products not having enough stock, the warning was displayed when being in editable list, but not in the popup form

This is a regression of rev. 86f785ae1b2741ab67384f3022b971ab638daeb8

opw-619624
[FIX] purchase: replace company_id widget selection by option no_create

For selection fields, name_get calls to resolve the display name are client-side initiated, and will display "Unknown" if the user does not have read access to the selected company. And the reason for using a selection widget in the first place was to prevent inadvertent creation of companies. This is now doable via the no_create option, so we can remove the selection widget.
[IMP] account: bank statement reconciliation widget: remove a created line by clicking on it
[FIX] account: bank statement reconciliation widget: do not propose partial reconciliation if there are created lines
[FIX] account: bank statement reconciliation widget: prevent from accidentally creating an 'open balance' writeoff
[FIX] account: bank statement reconciliation widget: prevent from accidentally creating an 'open balance' writeoff by showing the 'create line' form