Generate Name Badges

As per.

http://wiki.civicrm.org/confluence/display/CRM/Name+Badge+for+CiviEvent

I have modified CRM/Utils/PDF/Label.php to add a new method:
function SetGenerator ($objectinstance, $methodname = 'generateLabel')

So you can override the default MultiCell by something more exotic, while keeping the logic around to format the pages and put each label at the right place in the page...

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