Handle negative values for flow

src/driver_topaseskr.cc

@@ -77,7 +77,7 @@ namespace
             "The current water flow.",
             DEFAULT_PRINT_PROPERTIES,
             Quantity::Flow,
-            VifScaling::Auto,
+            VifScaling::AutoSigned,
             FieldMatcher::build()
             .set(MeasurementType::Instantaneous)
             .set(VIFRange::VolumeFlow));