ENH: change argList get<> and getList<> from read<>, readList<>

- more consistent with dictionary method naming. The get<> or
  getList<> returns a value, doesn't read into a existing location.

applications/utilities/mesh/conversion/plot3dToFoam/plot3dToFoam.C

@@ -90,7 +90,7 @@ int main(int argc, char *argv[])
          FatalError.exit();
     }
 
-    const scalar scaleFactor = args.lookupOrDefault("scale", 1.0);
+    const scalar scaleFactor = args.lookupOrDefault<scalar>("scale", 1);
 
     const bool readBlank = !args.found("noBlank");
     const bool singleBlock = args.found("singleBlock");