bugfixes and improvements

added user notifications for some actions on orders
passbook passes will be voided when ticket is cancelled
printing notification looks nicer and has a better position
fixed: amount of bank charge not set
fixed: iban and bic validators didn’t strip all whitespace
fixes and improvements

orders only go through if all finishing steps were successful (made use
of transactions)
order and ticket numbers now have a prefix to be distinguishable
the site now requires IE 9
code cleanup