Started change to getbills to show total qty and amount of bills owed within the customer list.

Still having problems loadCustomerlist to make sure the customerlist reselects the item index that was being editted.
added cast to use current instance of MainForm instead of using new Mainform()

This corrects why the customerlistbox would not properlly reselect the previously selected TODO - fix if the name is changed as it will change in index in the list but not the selected method currently used