BUG: polyMesh::movePoints: clear cellTree since gets constructed using current geometry

so will be out of date (w.r.t bounding box, subdivisions) when the mesh moves.
Only when all cells stays in all the same boxes can you skip rebuilding it
so this was not deemed worthwhile. Fixes #172

src/OpenFOAM/algorithms/indexedOctree/indexedOctree.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  |
+     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -2535,16 +2535,6 @@ Foam::labelBits Foam::indexedOctree<Type>::findNode
 
     const node& nod = nodes_[nodeI];
 
-    if (debug)
-    {
-        if (!nod.bb_.contains(sample))
-        {
-            FatalErrorInFunction
-                << "Cannot find " << sample << " in node " << nodeI
-                << abort(FatalError);
-        }
-    }
-
     direction octant = nod.bb_.subOctant(sample);
 
     labelBits index = nod.subNodes_[octant];