Version 0.10.125

+ Added card type checks to Card.check.
+ Added data duplication for Events and Payments tables.
  Extended local database structure.
+ Added distinction between Card types for payments.Reader._handle_card class.
  STAFF, CASHIER and ADMIN card types should now trigger report signal generation
  instead of new_payable.
+ Added report.py module with basic implementation of report generation facilities.
+ Once-related payments have been refactored out of db module into once_payable.py.
  This change makes it possible for view.qml to behave in a same way for any payable
  type without exceptions for once tariffs.
+ payments.Payments not use OncePayable objects as default payable instead of None.