ENH: use main constant/triSurface directory for sampling surfaces (closes #704)

- these were previously taken from region-local directories
  (eg, constant/region/triSurface), but this becomes difficult to
  manage when there are many files and regions.

src/sampling/sampledSurface/sampledTriSurfaceMesh/sampledTriSurfaceMesh.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016-2017 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -647,7 +647,7 @@ Foam::sampledTriSurfaceMesh::sampledTriSurfaceMesh
             surfaceName,
             mesh.time().constant(), // instance
             "triSurface",           // local
-            mesh,                   // registry
+            mesh.time(),            // registry
             IOobject::MUST_READ,
             IOobject::NO_WRITE,
             false
@@ -679,7 +679,7 @@ Foam::sampledTriSurfaceMesh::sampledTriSurfaceMesh
             dict.lookup("surface"),
             mesh.time().constant(), // instance
             "triSurface",           // local
-            mesh,                   // registry
+            mesh.time(),            // registry
             IOobject::MUST_READ,
             IOobject::NO_WRITE,
             false
@@ -713,7 +713,7 @@ Foam::sampledTriSurfaceMesh::sampledTriSurfaceMesh
             name,
             mesh.time().constant(), // instance
             "triSurface",           // local
-            mesh,                   // registry
+            mesh.time(),            // registry
             IOobject::NO_READ,
             IOobject::NO_WRITE,
             false

src/sampling/surface/triSurfaceMesh/discreteSurface.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -642,7 +642,7 @@ Foam::discreteSurface::discreteSurface
             surfaceName,
             mesh.time().constant(), // instance
             "triSurface",           // local
-            mesh,                   // registry
+            mesh.time(),            // registry
             IOobject::MUST_READ,
             IOobject::NO_WRITE,
             false
@@ -680,7 +680,7 @@ Foam::discreteSurface::discreteSurface
             dict.lookup("surface"),
             mesh.time().constant(), // instance
             "triSurface",           // local
-            mesh,                   // registry
+            mesh.time(),            // registry
             IOobject::MUST_READ,
             IOobject::NO_WRITE,
             false
@@ -716,7 +716,7 @@ Foam::discreteSurface::discreteSurface
             name,
             mesh.time().constant(), // instance
             "triSurface",           // local
-            mesh,                   // registry
+            mesh.time(),            // registry
             IOobject::NO_READ,
             IOobject::NO_WRITE,
             false