Add on_inventory_retry_assign

A module that check the availability of the available delivery orders
when an inventory is set to 'done'. If the quantity of a product has
been reduced, delivery orders could become unavailable.
Add stock_picking_mass_assign

a module that allow to check the availability on a selection of delivery
orders, and an all the confirmed delivery orders by a scheduled action.
add translations to stock_picking_mass_assign
Sort pickings my min_date so they will be assigned according to
their expected date
[IMP] from a wave, a dispatch can be directly assigned
Use the correct model in views
Add failing assertions: date_expected is not updated on picking
Put a higher number in the function field priority

So min_date is computed before date_expected, so this one is
set with the correct min_date value.
[ADD] add fnct_search method on related_dispatch_ids field and use it for search on pickings
[FIX] last commit needs a more precise test
Merge pull request #4 from guewen/7.0-stock_picking_mass_assign

Add stock_picking_mass_assign
[IMP] use method already defined in main class on classes StockPickingOut/In
[IMP] update test to avoid dependence on sale_stock
Merge pull request #18 from guewen/stock_picking_update_date-fixes

Corrections on stock_picking_update_date:
bump ci config
updated translations
Add test for on_inventory_retry_assign, sort pickings by min_date
Use CamelCase for class name
Renamed on_inventory_retry_assign to stock_inventory_retry_assign
Better wording as suggested by @pedrobaeza