Handle F5 refresh on payment page to keep KAUFEN button active

It looks strange if a customer accepts terms of service and has choosen
his payment method , and just wants to refresh last page and the KAUFEN
Button get s disabled but all radio buttons and checkboes are still set.
set js init vars if EU PAYMENT IS ACTIVE,(needed for guest checkout)

Error undefined JS vars will occur otherhise if trying to save guest
account on OPC
Merge remote-tracking branch 'upstream/dev' into dev
Merge remote-tracking branch 'upstream/dev' into dev
updated paypal to 3.7.2

paypal updated to 3.7.2
removed unneeded zip
Merge pull request #21 from BluTiGeS/dev

Handle F5 refresh on payment page to keep KAUFEN button active, pull request/changes still needs review by Silbersaiten