[FIX] sale: fix and improve behavior of sale customer portal

 * display canceled or done status of quotations on quotation page
   view in order to ease user navigation;
 * allow to filter on state;
 * fix breadcrumb for canceled quotations, currently telling 'Sales
   Orders' instead of 'Quotations';
 * display order shipping address only if multi address group
   is activated;
 * display order expiration date on sale order customer portal;
 * when signed, add help message on disabled 'Sign' button telling
   when and by who the order has been signed;
 * fix download button display and alignment in quote template

This commit contains squashed commits coming from @jpr-odoo and
@abh-odoo .