ENH: simplify tetrahedron and triangle handling

- combine header definitions, more pass-through methods

- face/triFace: support += operator (vertex offset)

src/sampling/surface/isoSurface/isoSurfaceCell.C

@@ -36,7 +36,7 @@ License
 #include "triSurface.H"
 #include "triSurfaceTools.H"
 #include "Time.H"
-#include "triPoints.H"
+#include "triangle.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 

src/sampling/surface/isoSurface/isoSurfacePoint.C

@@ -32,7 +32,7 @@ License
 #include "volFields.H"
 #include "triSurfaceTools.H"
 #include "triSurface.H"
-#include "triPoints.H"
+#include "triangle.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 

src/sampling/surface/isoSurface/isoSurfaceTopo.C

@@ -31,7 +31,6 @@ License
 #include "volFields.H"
 #include "edgeHashes.H"
 #include "tetCell.H"
-#include "tetPointRef.H"
 #include "DynamicField.H"
 #include "syncTools.H"
 #include "indirectPrimitivePatch.H"