[FIX] website_sale and point_of_sale fixes

Fixes an error introduced in f6fb2b69

If any missing or partially incorrect values cause
an exception other than a psycopg2 error, we should
still catch it, rollback that record and report
the error, rather than letting bubble and fail
without any feedback to the user.

Fixes #1485

[FIX] account: res.partner: limit access to "total_invoiced" field to group "group_account_invoice". Use SUPERUSER_ID to access data

[FIX] website_sale: everytime you want to change both billing & delivery address, any change creates duplicates in the backend

When we compute the discount of a product to display (result of product_id_change), we compare prices in the currency of the product while we expect prices in the currency of the pricelist. opw 606188

When a record is created, the magic fields (id, create_date,...) are first removed from the vals as the user should not set a value for these.
However if a value for this is given in default value (e.g. defined in an ir.value), the creation would crash (sql error : column specified more than once) as the magic column would be added again.

Same behavior than in saas-5

It was not possible to subscribe again to a mailing list once unsubscribed

These parameters are (or should be) irrelevant for
a search_count(), and they could actually break the
result or make it significantly slower (e.g applying
`order` on large tables).
This fixes a performance regression introduced by
0f43032b.

We could also raise an error offset/limit are
passed in combination with count, but that seems
unnecessary.

Also switched to "SELECT count(1)" for the count
query, as it is simpler and just as fast.
We'd get the same perf with * or any constant value,
as in "SELECT count('me in')", but let's keep it
simple ;-)

[FIX] website: the media video create by the media editor is not display in firefox. change the css to display the video and add z-index to the div for edit mode

Will fix problem where opened dropdown list were hidden behind the modal footer

[FIX] mass_mailing: allow to add a user/email to a specific mailing list and not always the last as previously.

There is no reason to propagate the context in those buttons.

Besides, it leads to issues concerning the email template, rendering the wrong res_id because the active_id was wrongly propagated

Same as for rev 4bad513d, the references were not correctly parsed, added missing regex

and without spaces for vat

tooltip stuck visible should be removed on click + remove tooltip container except for modal in order to prevent them for staying visible in some rare occasion

[FIX] point_of_sale: On product form : push on button 'Set a Custom Ean' on tab information raise an exception => Use a record action and clean python files

[FIX] website_customer: check that country id exists before access the name, else traceback when we come from a non existing id via the url/controller

When we duplicate a project, the related phases need to be duplicated as well but keeping references between each other.
e.g. 'project 1' with 'phase A' follwed by 'phase B' should become 'project 1 (copy)' with 'phase A (copy)' followed by 'phase B (copy)'.
Fixing bug lp:1212860, opw 607062

When we cancel a voucher, we may be trying to unlink a reconciliation that was already removed on another move (just looking at the version in cache). In such cases, the unlink would fail with traceback. opw 610287