add RunDataFlowTemp and RunDataReturnTemp to hmu (closes #496)

Author: roe-lz

src/vaillant/08.hmu.tsp

@@ -1515,6 +1515,20 @@ namespace Hmu {
     value: tempv;
   }
 
+  @inherit(r_7)
+  @ext(0xfc, 0x8)
+  model RunDataFlowTemp {
+    /** current flow temp, accurate to 2 decimal places */
+    value: tempv;
+  }
+
+  @inherit(r_7)
+  @ext(0x6, 0x9)
+  model RunDataReturnTemp {
+    /** current return temp, accurate to 2 decimal places */
+    value: tempv;
+  }
+
   @inherit(r_7)
   @ext(0xb8, 0xb)
   model RunStatsHMUHours {