RestAPI: add abstract methods
RestAPI: add abstract methods

These are not implemented, but because they are defined in abstract parent class Controller_Data as abstract methods they need to be present here. For now just throw exceptions.
atk4/atk4,samratcis/atk4,atk4/atk4,atk4/atk4,svisystem/atk4,svisystem/atk4,samratcis/atk4,samratcis/atk4,xepan/atk4,atk4/atk4,svisystem/atk4,xepan/atk4,xepan/atk4