only use alpha channel if it exists
[FIX] point_of_sale: fixed rounding issue for pos order when discount added(maintenance: 615322).
[FIX] web: keep pager in popup list view

When an action opens records in list (or other) mode in a popup (target:new), the pager should be kept. It can be removed in form view.
Fixes #742
[IMP] models: improve query generation for _write() and _store_set_values()
[FIX] mail: partners with missing/invalid emails must not halt notifications to others
[FIX] web_kanban: wrong condition to reset the dataset index

This is related to rev. a218a9ed3f6c965820f2ebdf76ee0e6c89c59a0c

The condition is good, but not in the right place: It should be done once all read_slice (all columns records) are fetched, not at each read_slice end
[MERGE] forward port of branch 7.0 up to be7c894
[MERGE] forward port of branch saas-3 up to f7a76cb
[IMP] point_of_sale: show traceback when there is a posbox error
[FIX] web: regard the view_list has valid if not yet loaded

This fix is related to df845940ed52040ef92b1b5759306c556fa38e66

Fixes #3469
[MERGE] forward port of branch 7.0 up to 9a37e5a
[MERGE] forward port of branch saas-3 up to c11451c
[FIX] ir_qweb, website_blog: Allow to pass inline style as an option for the widget image. And change some img from blog to use this widget
[IMP] models: improve _mapped_func(), and add parameter 'reverse' in sorted()
[FIX] Report: get_pdf:  don't miss main elements when parsing html

Main elements can have more than one class, thus can be ignored by the previous
naive xpath. This patch brings a stronger xpath.
[FIX] product: pricelists based on the supplier prices now return first supplier price if partner not in suppliers instead of returning 0

Without this, sale pricelists cannot be based on supplier prices as the partner is never a supplier so the price would be 0
Note: behavior change ok with fp
[FIX] mrp: chain product move and MO locations

When validating a SO containing a `make to stock` + `manufacture` product
(with bom + orderpoint), we have the following stock moves:
* Product move
* Manufacturing order
Selling 1 such product would yield 2 as incoming quantity, an
inconsistency that this commit solves by setting the location_id of the
product move to the MO's location_dest_id (in the same fashion that
the create_pickings method does in an mts/buy case)

opw-616229
[FIX] ir_qweb: contact widget: use name_get instead of display_name

display_name field is overidden in res.partner in order to pop the context
key leading to show the address, and we want the address.
[FIX] web: inhibit on change flag when validating editable list

To valid all editable list line, we iterate on the lines and set the editor form with the line value, using set_value.
The _inhibit_on_change_flag should be set to True to avoid triggering on changes events

opw-617395
[MERGE] forward port of branch 7.0 up to cd69dee