foamyHexMesh: Made default region volume type that of it's parent

Foamy surface conformation entries have a "meshableSide" entry which
controls which side of the surface is to be meshed. Typically this is
set "inside" for boundaries and "both" for baffles. A sub-region's
default entry is now taken from it's parent, rather than a specific
value (it was "inside"). This is consistent with how other entries are
handled.

surfaceConformation
{
    locationInMesh      (0 0 0);

    geometryToConformTo
    {
        baffle
        {
            featureMethod           extractFeatures;
            includedAngle           120;
            meshableSide            both; // <-- per-surface setting

            regions
            {
                disk
                {
                    meshableSide    both; // <-- per-region setting*

                    // *in this example, this entry is not needed, as it
                    // is taken from the per-surface setting above
                }
            }
        }

        // ...
    }
}

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformationSurfaces/conformationSurfaces.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2012-2016 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2012-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -443,7 +443,11 @@ Foam::conformationSurfaces::conformationSurfaces
                                  regionDict.lookupOrDefault<word>
                                  (
                                      "meshableSide",
-                                     "inside"
+                                     extendedFeatureEdgeMesh::
+                                     sideVolumeTypeNames_
+                                     [
+                                        globalVolumeTypes[surfI]
+                                     ]
                                  )
                             ]
                         );