Fix for Bug 7123 - barcode should be one word

Fix for Bug 7123 - barcode should be one word

Other fixes thrown in for good measure:

- Adding data to the results table to match output of returns
- Better checking of error codes in the script to control
  output of error messages (don't show error box when there
  are no errors).
- Move some errors/messages from the right column onto the
  top of the page to match Koha's established pattern.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>