[FIX] project : do not show canceled projects in task

fixes #938, opw 610318
[FIX] web: reload after wizard when record has been removed cause exception

If an action unlink the current records (e.g. unreconcile on account.move.reconcile), trigger history_back to avoid errors when trying to reload inexistant record (opw 607883)
This is a partial backport of saas-4 code (rev c0db6ae, 162ad1c) and should not be forward ported.
[FIX] delivery: use unit of measure and not unit of stock to compute price of delivery

The computation expects uom and it was wrongly passing uos qunatities.
[FIX] stock: allow same serial number for different products

Bug lp:1222289, opw 597639
[FIX] web: correct rev 680f955

Missing backport of commit f652402 for buffered dataset
Again, should not be forwardported
[FIX] mail: display translated model name at record creation

When a record is created, if it inherits from mail.thread, a message 'OBJECT created' is posted. 'created' is translated but the name of the model wasn't.
This fix uses the name of the linked ir.model which is already a translatable field.
lp:1262000, opw 611043
[FIX] purchase_analytic_plans: keep reference to analytic distribution

Purchase orders created with invoice policy 'Based on incoming shipments' were not keeping the reference to the account analytic distribution when invoiced. opw 607577
[IMP] account: do not offer closed analytic accounts on invoices

lp:1223922, opw 609656
[FIX] stock: do not set user_id on prepare_invoice_group

The user_id is already set by the prepare_invoice method, which is called before the prepare_invoice_group (the user_id is already set, thus)
Besides, _prepare_invoice is overriden in sale_stock, to set the picking sale order salesman as user_id, and, without this correct, grouping invoicse by partner re-set the user_id to uid, which is wrong.
[ADD] base_vat: add VAT validation for Peruvian localization.
[FIX] ir_fields: allow accent on selection import

If the selection label (not value) had accents, it wasn't possible to import it using the label having accents
[ADD] safe_eval: UNPACK_SEQUENCE and Exception

Allowing UNPACK_SEQUENCE allows the use of the "multi" assignation:
a, b = [1,2]
for a,b in items