[FIX] tools: remove useless attributes
[MERGE] Forward-port of 7.0 up to 9b1a9c9
[FIX] im_livechat: ir.config_parameter must be read as superuser

As ir.config_parameter is restricted to employees in ACL, for security reasons
[FIX] account: sort partner ledger report by partner ref, name
[MERGE] forward port of branch 7.0 up to 419c439
[FIX] hr_expense: computation of tax/base amount

When computing the amount for a tax (included) with children, accumulate the included taxes to avoid taking only the last one (opw 614867).
[FIX] hr_payroll_account: do not create entries with amount at 0

If the salary compuation gives a salary of zero, skip the creation of the account.move.line (not good to have lines at 0).
Fixes lp:1298116, opw 605816
[FIX] purchase: minmum purchase quantity and float precision (opw 610557)
[FIX] product: name_search handles negative operators
[MERGE] forward port of branch 7.0 up to 9cc54dc
[MERGE] forward port of branch saas-3 up to 3d4b82c
[FIX] stock: allow the user to use the '!=' operator in domains for 'Qty on Hand' and 'Qty available'. Fixes #2763
[FIX] correct typo introduce during forward-port in commit 388f1a1
[FIX] account: recordsets are not sortable in-place
[FIX] website: repair compatibility with 8.0rc1 carousel (banner) snippets that may be present in existing pages
[FIX] website: editor: ignore spurious changes for editable content

Changes to contentEditable or attributeEditable attributes
should not cause the corresponding section to be marked
as dirty (oe_dirty). This would otherwise cause an extra
editor save() for those, wrongly marking untouched
templates as `noupdate`, and possibly triggering access
right errors.
[FIX] website_sale: too tiny quantity input (if qty > 9)
[ADD] contribution files and image removed at 2ad092b
[IMP] website: add snippet for floating picture
[IMP] ir_qweb: allow to display a datetime like a date