Missing information in the receipt

Hi,

We have gotten feedback from Desjardins after an initial certification attempt.

They mention that information about the client is missing on the receipt page as we get back from the Desjardins server.

I submit the following patch, which does:

• Adds the customer's billing address and phone number to the receipts,
• Now distinguishes the card holder name from the client's name,
• Gives a css class to the 'Go back to cart' links on the receipt pages so that they can be hidden when printing the receipt,
• Fixes a drupal_set_message call to tag it as an error.

-Patrick