[FIX] mail: allow to set own batch size for mass mailing
[FIX] mail: batch_size expects an integer
[IMP] account : Add reference field to Invoice report
[FIX] product_extended: price from bom is build for product templates

As it sets the standard_price field, which is defined on product templates only: setting the standard price of a product variant will lead to set the standard price to all the variants of the product template.

There is therefore no meaning to compute and set the standard price of product variants according to the boms
Revert "[FIX] stock_picking_wave: removed obsolete many2many widget from stock_picking_wave_view"

This reverts commit 436bbb0a48ff866925fe0a3987928ab554bc3c6d.

The many2many widget is usefull, as it allows to select an existing picking instead of creating a new one when clicking add an item from the list
[DOC] web: search view: extra info about key events handling

Complements bde1a4432fef4cb2f5fe8ab600e72ab5b8b4830d