Merge branch 'master-pos-wms-fva'

Big Point of Sale Update !
==========================

 - Loyalty module for loyalty cards and loyalty rewards
 - Restaurant module has floor plans, and floor plan editor
 - Restaurant module has orderline notes ( Bloody / Well Cooked ... )
 - Customers can be created from the point of sale
   * You can take customers picture from Android / iOS
 - In-progress orders are kept between crashes and restarts
 - Barcode Nomenclatures support complex and custom barcode systems
   * Shared configuration with the WMS.
   * Product weight support in the WMS UI.
   * Multiple barcodes for the same product via barcode aliases
   * EAN-13 constraint removed, no more internal-code hacks.
 - Cashier Login / Logout from the point of sale with pin codes
   * a JS sudo() interface to help integrators customize the point
     of sale security:

    this.pos.sudo().then(function(){
        ... // only POS Managers can do this.
    });

 - QWeb receipt customisation for header and footers :
   * You can now include barcodes & other complex info, without
     new modules with the `<!DOCTYPE QWEB>` prefix in textareas :

     <!DOCTYPE QWEB>
     <div>
        <t t-esc="Math.random() + 'foobar'" />
        ...
     </div>

 - Lots of fixes & Usability improvements from customer feedback.
 - New demo data will come in a later commit.