* Don't generate upgrade orders if the plan and the billing cycle didn't
change. WHMCS freaks out otherwise.
* Clean up some deadcode in BillingUpgradeDowngrade.php
* Squash an error in the invoice view if there's no invoices
* Basically working now except for VAT calculation
* Includes pricing grid, basic total calculation
* Revamped layout
* Implemented getting the service ID in BillingController.php
Albert Santoni
drigato