add exception handler for areverse

areverse2/src/areverse.cpp

@@ -42,7 +42,11 @@ int main(int argc, char** argv) {
 	} catch(const TCLAP::ArgException& exception) {
 		std::cout << exception.error() << std::endl;
 		return 2;
+	} catch (const std::exception& exception) {
+		std::cerr << "Exception caught: " << exception.what() << std::endl;
+		return 3;
 	} catch(...) {
+		std::cerr << "Unknown exception caught." << std::endl;
 		return 127;
 	}
 }