Since the new views, most of the barcodes feature was
broken. This commit re-enables the support of commands like
'edit', 'save', 'cancel', 'previous' and 'next'.
Also changed javascript event handler to jquery event handler to
make barcodes testable in phantomjs.
With the new views, the barcode mechanisms were completely broken,
because the view and widget JS code was totally changed.
This commit update and refactor all that code to make it work with the
new design philosophy. Also, it update the coding style.
Akash Bhavsar