[IMP] useability main flows and some bugfixes

addons/account/account_invoice_view.xml

addons/crm/crm_opportunity_view.xml

addons/delivery/delivery_view.xml

addons/point_of_sale/pos_view.xml

addons/product/product_view.xml

addons/sale/sale.py

addons/sale/sale_view.xml

addons/stock/product_view.xml

addons/stock/stock_view.xml

addons/stock/wizard/stock_partial_picking.py