STYLE: volSurfaceMapping is const

applications/solvers/finiteArea/liquidFilmFoam/createFvFields.H

+// Volume-to surface mapping object
+const volSurfaceMapping vsm(aMesh);
+
 volVectorField U
 (
     IOobject
@@ -26,6 +29,3 @@ volScalarField H
     mesh,
     dimensionedScalar(dimLength, Zero)
 );
-
-// Create volume-to surface mapping object
-volSurfaceMapping vsm(aMesh);

applications/solvers/finiteArea/sphereSurfactantFoam/createVolFields.H

-    // Create volume-to surface mapping object
-    volSurfaceMapping vsm(aMesh);
+    // Volume-to surface mapping object
+    const volSurfaceMapping vsm(aMesh);
 
     volScalarField Cvf
     (

applications/solvers/finiteArea/surfactantFoam/createVolFields.H

-    // Create volume-to surface mapping object
-    volSurfaceMapping vsm(aMesh);
+    // Volume-to surface mapping object
+    const volSurfaceMapping vsm(aMesh);
 
     volScalarField Cvf
     (

src/optimisation/adjointOptimisation/adjoint/optimisation/adjointSensitivity/incompressible/sensitivitySurface/sensitivitySurfaceIncompressible.C

@@ -305,7 +305,7 @@ void sensitivitySurface::smoothSensitivities()
     dimensionedScalar one("1", dimless, 1.);
 
     // Mapping engine
-    volSurfaceMapping vsm(aMesh);
+    const volSurfaceMapping vsm(aMesh);
 
     // Source term in faMatrix needs to be an areaField
     areaScalarField sens