[MERGE] Forward-port of 7.0 bugfixes up to 4d3a5df0

addons/account/account.py

addons/account/account_move_line.py

addons/account/partner.py

addons/base_action_rule/base_action_rule.py

addons/base_action_rule/base_action_rule_data.xml

addons/delivery/__openerp__.py

addons/delivery/stock.py

addons/delivery/test/delivery_chained_pickings.yml

addons/hr_timesheet_sheet/hr_timesheet_sheet_view.xml

addons/l10n_multilang/account.py

addons/sale_stock/sale_stock.py