printjob improvements

Just a small update to let you know the latest improvements in the printjob module, which can be found in the community addons:

• It is now possible to update the printer list with the printers available on the current CUPS server, so there is no need to create them manually.
• CUPS printer status (printing, idle or error) is shown in the printer list and form.
• A new action opens a browser with the CUPS administration interface.