only use alpha channel if it exists
[FIX] web_diagram, unlink connectors/transitions between nodes from the diagram view (transitions IDs sent to the web client were strings instead of integers)
[FIX] sale: translate advance message on advance invoice
[FIX] mail: set the parent_id to the first message of type email

And fallback of any type if there is none of type email

This fix allow the communication between two mail thread from two different Odoo servers having message creation subtypes, like project issue or crm lead
[FIX] point_of_sale: fixed rounding issue for pos order when discount added(maintenance: 615322).
[FIX] account_followup: do no duplicate partner's account.move.line

Duplicating a partner should not duplicate the content of the unreconciled_aml_ids field.
[FIX] l10n_fr_hr_payroll: report "Fiche de paye"

Avoids getting False for the field end_date (Sortie) in case of no end date specified on the contract. opw 614624
[FIX] l10n_fr_hr_payroll: bad copy-paste in 69c1333
[FIX] res_partner: add parent_name related field

In some cases (e.g. with record rules), the name_get might not have access
to the parent name. Therefore a parent_name related field solves the
issue (as it read with as superuser).
[FIX] account: default product taxes on product.template

As product.template is now most commonly used than product.product

This is related to fix 96dd8bf
[FIX] website_sale: image doesn't change when the user select a product (for product variant list). website_sale_options: image dones't change in modal with the selection
[FIX] {web,point_of_sale}: allow cross-origin access to company logo
[FIX] website_forum: respect karma when posting questions/answers/comments + more user-friendly errors

While posting new questions and answers the check
for karma limit was bypassed because it was using
super-user mode: use regular user instead.
Also improve the user feedback when karma level is
too low to perform some actions: post comment,
post question, post answer.
The usability in these cases still needs to be
improved.
[DOC] cmdline: database-related parameters
[FIX] point_of_sale: no need to specify numeric digits

In the report pos order, average_price was set as a numeric(16,2), therefore, if the amount was too big, it led to a psql crash:
A field with precision 16, scale 2 must round to an absolute value less than 10^14.
[MERGE] forward port of branch 7.0 up to 78a29b3
[MERGE] forward port of branch 8.0 up to d80376a
[IMP] web_graph: renamed Quantity field into Count to avoid ambiguities
[FIX] report: page numbering rml reports

Save the NumberedCanvas state before doing a page reset.
The order of execution when rendering an rml report is the following:
1. init canevas (_pageNumber = 1)
2. render the page element
3. if still pages to render, afterPage method
4. if still pages to render, showPage method (_pageNumber += 1)
5. back to step 2 for each page
6. draw the ResetPage element (setting flag _doPageReset=True)
7. end the document build with afterPage & showPage method

The PageReset element should be executed at the end of the rendering of a story (subdocument) to reinitialize the page numbers to 0 (for new story) and insert the pageCount element for that story with the total number of pages (needed if want to use tag <pageCount/> in rml).

In case of NumberedCanvas (e.g. used in Trial Balance report), the numbering is generated at the end of the build using the _saved_page_states dict in the canevas.
To have an accurate _saved_page_states content, it needs to be saved before the pageReset.

Fixes #2225
[FIX] website_certification: no need to set a group to acl if the data is public