ENH: provide basic hooks for alternative List/Matrix allocators

- include "contiguous.H" in ListPolicy, which makes it available
  whenever UList.H has been included

ENH: return plain List instead of shrinking the DynamicList

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/initialPointsMethod/bodyCentredCubic/bodyCentredCubic.C

@@ -193,7 +193,7 @@ Foam::List<Vb::Point> Foam::bodyCentredCubic::initialPoints() const
         }
     }
 
-    return initialPoints.shrink();
+    return List<Vb::Point>(std::move(initialPoints));
 }
 
 

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/initialPointsMethod/faceCentredCubic/faceCentredCubic.C

@@ -254,7 +254,7 @@ Foam::List<Vb::Point> Foam::faceCentredCubic::initialPoints() const
         }
     }
 
-    return initialPoints.shrink();
+    return List<Vb::Point>(std::move(initialPoints));
 }
 
 

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/initialPointsMethod/rayShooting/rayShooting.C

@@ -272,7 +272,7 @@ Foam::List<Vb::Point> Foam::rayShooting::initialPoints() const
         }
     }
 
-    return initialPoints.shrink();
+    return List<Vb::Point>(std::move(initialPoints));
 }
 
 

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/initialPointsMethod/uniformGrid/uniformGrid.C

@@ -173,7 +173,7 @@ Foam::List<Vb::Point> Foam::uniformGrid::initialPoints() const
         }
     }
 
-    return initialPoints.shrink();
+    return List<Vb::Point>(std::move(initialPoints));
 }
 
 

applications/utilities/mesh/manipulation/splitMeshRegions/splitMeshRegions.C

@@ -256,7 +256,7 @@ labelList getNonRegionCells(const labelList& cellRegion, const label regionI)
             nonRegionCells.append(celli);
         }
     }
-    return nonRegionCells.shrink();
+    return labelList(std::move(nonRegionCells));
 }