[IMP] website_quote: onboarding

Views and labels improvements
[IMP] mrp, stock: default uom missing value when importing from csv
[REM] website: my_account link under user menu

This link is not useful anymore as we do have frontend/backend menu
integration since Odoo v8.0.
[IMP] website_hr_recruitment: resume in chatter
[IMP] website_quote: copy suggested products
[ADD] website_sale_coupon : allows to give a coupon to customer, with validity, available for some products