* 07/10/2007 Version 2.0
* - googlecheckout.php
* - added ability to tax shipping
* - added ability to choose what is shown for the item description in Google's Checkout
* - added edit link in Google's Checkout so the buyer can make changes to the shopping cart before confirming an order.
* - added option to input URL that allows the buyer to continue shopping after confirming an order.
* - fixed coupon for fastcheckout
* - added ablilty for world wide shipping
* - updated to use google libary from google-checkout-php-sample-code-v1.2
* - added ablilty for multiple tax rates
* - responsehandler_gc.php
* - Integration level 2
* - Updates order status in VirtueMart backend
* - Updates product stock levels
* - updated to use google libary from google-checkout-php-sample-code-v1.2
* - logs to googleerror.log and googlemessage.log
* - Added support for downloadable products for regular checkout
* todo
* - Add Google Analytics
* - Add Fast Checkout orders to VM backend?
* 04/25/2007 Version 1.6
* - Changed license scheme
* - updated to use google libary from google-checkout-php-sample-code-v1.1.2
* 04/18/2007 Version 1.5
* - support uk
* 04/14/2007 Version 1.4
* - fixed Warning: Cannot use a scalar value as an array in /home/xxx/public_html/administrator/components/com_virtuemart/classes/ps_cart.php on line 156 etc..
* 04/01/2007 Version 1.3
* - only add shipping if there is a rate
* - added check for $checkout_this_step == CHECK_OUT_GET_FINAL_CONFIRMATION