* Module are now using OpenCart internal methods to calculate order totals
* Added order totals to ignore in Payson module configuration
* Merged a lot of code from PaysonInvoice to PaysonDirect
* Removed some configration from PaysonInvoice as same information are entered in PaysonDirect module
* Reorganized PaysonDirect module configration elements
* Now using Payment details on return from Payson instead of relying only on IPN calls
* Better error handling
* No longer creating two tokens for every purchase