merchant details and contract terms details factored out, to be used by other components
tests and stories updated
payment completed != confirmed (confirmed if paid by someone else)
-fix fulfillment messages
-fix product list pricing and image on payment
-filter exchange by currency on withdrawal
-error message on operation error on withdrawal
-add taler url on balance page (just for dev)
-add no balance help
-better text when doing manual withdraw for the firt time
-removed balance from wallet (just history)
-removed pending page