[FIX] stock: groups mixup in views

Use group_production_lot for serial options, group_stock_packaging for packaging, use group_tracking_lot for pallet/parcel
Groups are removed completly from the view for stock.tracking as they render the view useless.

Always display weights on the product form
They really have nothing to do with the logistic units and we don't have another group to restrict them to.

Fixes #1443
[ADD] l10n_lu: abbreviated financial reports

Abbreviated version of the p&l and balance sheet reports
[FIX] account: self typo
[FIX] gamification: on delete badge user, cascade

Otherwise, this is no more possible to delete users having badges
[FIX] ir.ui.view: creating custom views in backend did not compute view type

When creating new records in backend all field values are
sent to the server, including empty fields.
[FIX] Can not execute line when stop date is EARLIER than current date
[FIX] migration: test if package is installed using its state.

checking if there is an installed version set is not enough because this field is not reset when the module is uninstalled
Merge pull request #2955 from odoo-dev/8.0-wmsmrpdatefix-jco

[FIX] Can not execute line when stop date is EARLIER than current date
[FIX] ir_actions: ids of unlink method can either be an ID list or one ID
[FIX] account: precision_get returns a number of digits

In other words, it returnes a precision digits, not a precision rounding
[MERGE] forward port of branch 7.0 up to 03df412f
[IMP] gamification: avoid sending twice emails in cron

When the cron is running on a database with a large number of goals (e.g. website_forum with thousands of users), it's possible the CPU time is exceeded and we may have a rollback after sending some emails (for granted badges).
To avoid sending twice emails, commit in cron mode after each reward.
[FIX] point_of_sale: prevent empty order creation as they are not accepted by the backend
[FIX] website_sale: save the company in street and the street in street2.

The old behaviour was not better, because when we print the invoice, the order was ugly:
    Name
    Street
    Company name
    Country

Now we will have:
    Name
    Company name
    Street
    Country

This patch is not retro-compatible:
   Old partners will see the address in company name and vice-versa.
   Need to update view and switch street field and street2 field
[IMP] website_event: add mail subtypes

Add published and unpublised mail subtypes, to track events publication, and to be able to follow these subtypes
[FIX] kanban: remove container=element for tooltips on kanban
[FIX] dict notation for js reserved words in options (Fixes #2957)
[FIX] pos_restaurant: Issue 614981: product renaming from name to display_name was not done in the pos_restaurant module, resulting in empty product names in various places
Revert "[FIX] Error when installing module document"

This reverts commit 8dd4c83d9cf6f45ca39f120b296c1c69079154a4.
It does not fix the issue, but hides it instead.
An actual fix has been made since.
[FIX] website_sale*: handle no delivery methods in website

Display a user friendly message instead of crashing when there is not delivery method available for a specific order