Feature decompose par dict

Merging remaining functionality to do with -decomposeParDict parallel argList option.

applications/utilities/mesh/generation/extrude/extrudeMesh/extrudeMeshDict

@@ -63,6 +63,10 @@ extrudeModel        wedge;
//- Extrudes into sphere with grading according to pressure (atmospherics)
//extrudeModel        sigmaRadial;
+//- Extrudes by interpolating along path inbetween two (topologically identical)
+//  surfaces (e.g. one is an offsetted version of the other)
+//extrudeModel        offsetSurface;
+
nLayers             10;
expansionRatio      1.0;
@@ -105,6 +109,16 @@ sigmaRadialCoeffs
pStrat          1;
}
+offsetSurfaceCoeffs
+{
+    // Surface that mesh has been meshed to
+    baseSurface "$FOAM_CASE/constant/triSurface/DTC-scaled-inflated.obj";
+
+    // Surface to fill in to
+    offsetSurface "$FOAM_CASE/constant/triSurface/DTC-scaled.obj";
+}
+
+
// Do front and back need to be merged? Usually only makes sense for 360
// degree wedges.
mergeFaces false;