Updates to Currency Converter

[iCraft Admin]

To make sure people don't leave the site when they see product prices in a foreign currency, we've added auto-detection and automatically converted all prices to the user's native currency.
People can then change the price currency on any product page to another one the same way they do now.
We've also added notes on the Checkout and other pages about the currency conversion. Please take a look and try to add things to the Shopping Bag to see if messages are making sense to you. Your feedback is appreciated. Thanks!