ENH: use areaAverage instead of average for -func patchAverage (#1303)

- this corresponds more closely to the expected behaviour of a
  patch-average value being independent of the local face
  discretization

etc/caseDicts/postProcessing/surfaceFieldValue/patchAverage

@@ -6,14 +6,14 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 Description
-    Calculates the average value of one or more fields on a patch.
+    Calculates the area averaged value of one or more fields on a patch.
 
 \*---------------------------------------------------------------------------*/
 
 name    <patchName>;
 fields  (<field names>);
 
-operation average;
+operation areaAverage;
 #includeEtc "caseDicts/postProcessing/surfaceFieldValue/patch.cfg"
 
 // ************************************************************************* //

etc/caseDicts/postProcessing/surfaceFieldValue/patchIntegrate

@@ -10,8 +10,8 @@ Description
 
 \*---------------------------------------------------------------------------*/
 
-name   <patchName>;
-fields (<field names>);
+name    <patchName>;
+fields  (<field names>);
 
 operation areaIntegrate;
 #includeEtc "caseDicts/postProcessing/surfaceFieldValue/patch.cfg"