Fix relative measurement graphing

config/Windows/productionroaster.xml

 			emitter.measurement.connect(graph.newMeasurement);
 		}
 		for(var i = channels.length; i < channels.length + rateCalculators.length; i++) {
-			var offset - new MeasurementTimeOffset(epoch);
+			var offset = new MeasurementTimeOffset(epoch);
 			rateoffsets.push(offset);
 			rateCalculators[i - channels.length].measurement.connect(offset.newMeasurement);
 			var adapter = new MeasurementAdapter(i + 1);

src/typica.w

 	gridLinesF(new QList<QGraphicsItem *>),
 	gridLinesC(new QList<QGraphicsItem *>),
 	relativeGridLines(new QList<QGraphicsItem *>),
-	relativeEnabled(false)@/
+	relativeEnabled(false),
+	relativeAdjuster(new LinearSplineInterpolator)@/
 {
 	setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 				relativeGridLines->append(label);
 				if(unit == "F")
 				{
-					relativeAdjuster->add_pair(key, y);
+					relativeAdjuster->add_pair(key, -y);
 				}
 				else
 				{
-					relativeAdjuster->add_pair(key * (9.0/5.0), y);
+					relativeAdjuster->add_pair(key * (9.0/5.0), -y);
 				}
 				y -= skip;
 			}
 	{
 		if(measure.value("relative").toBool())
 		{
-			measure.setTemperature(relativeAdjuster->newMeasurement(measure).temperature());
+			if(relativeEnabled)
+			{
+				measure.setTemperature(relativeAdjuster->newMeasurement(measure).temperature());
+			}
+			else
+			{
+				return;
+			}
 		}
 	}
 	if(translations->contains(tempcolumn))