convert sms messages to LAT format

While full unicode is not supported for old mobiles,
we decided to send SMS messages using just ASCII
characters. These changes affects only part related
to Network application notifications.
adding new types for change-power-application

we added two new types for Network::ChangePowerApplication
based on requirements from Lali Khutsishvili
locking print paybill when amount not defined

today we had a call from a customer, who failed to print
paybill due to incorrect power/voltage combination. our
program gave no notification to inform the user about the
problem.