[IMP] point_of_sale: support for non ean13 barcodes using the Internal Reference field
[MERGE] from trunk
[FIX] point_of_sale: order close confirmation was put on all header buttons instead of just the close button
[MERGE] point_of_sale: fixing the confirmation dialog in self checkout mode
[MERGE] from trunk
[MERGE] point_of_sale: support for scanning non ean13 barcodes with the internal reference field