Fixed bug #1196:  Product barcode search does not expect 13th digit on EAN13 type
Some code written by "hipnosapo" forum user in http://www.dolibarr.es/index.php/foro/7-bugs-versiones-estables/3891-ean13-buscador-codigo-barras-13-digitos#3891
Little refactor in product/liste.php
Merge pull request #1350 from marcosgdf/bug-1196

Fixed bug #1196: Product barcode search does not expect 13th digit on EAN13 type