Remove unnecessary R files

tutorials/buoyantFoam/hotRoom/0/R

-/*--------------------------------*- C++ -*----------------------------------*\
-| =========                 |                                                 |
-| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
-|  \\    /   O peration     | Version:  1.5                                   |
-|   \\  /    A nd           | Web:      http://www.OpenFOAM.org               |
-|    \\/     M anipulation  |                                                 |
-\*---------------------------------------------------------------------------*/
-FoamFile
-{
-    version     2.0;
-    format      ascii;
-    class       volSymmTensorField;
-    object      R;
-}
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-dimensions      [0 2 -2 0 0 0 0];
-
-internalField   uniform (0 0 0 0 0 0);
-
-boundaryField
-{
-    floor           
-    {
-        type            zeroGradient;
-    }
-
-    ceiling         
-    {
-        type            zeroGradient;
-    }
-
-    fixedWalls      
-    {
-        type            zeroGradient;
-    }
-}
-
-// ************************************************************************* //

tutorials/buoyantSimpleFoam/hotRoom/0/R

-/*--------------------------------*- C++ -*----------------------------------*\
-| =========                 |                                                 |
-| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
-|  \\    /   O peration     | Version:  1.5                                   |
-|   \\  /    A nd           | Web:      http://www.OpenFOAM.org               |
-|    \\/     M anipulation  |                                                 |
-\*---------------------------------------------------------------------------*/
-FoamFile
-{
-    version     2.0;
-    format      ascii;
-    class       volSymmTensorField;
-    object      R;
-}
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-dimensions      [0 -2 -2 0 0 0 0];
-
-internalField   uniform (0 0 0 0 0 0);
-
-boundaryField
-{
-    floor           
-    {
-        type            zeroGradient;
-    }
-
-    ceiling         
-    {
-        type            zeroGradient;
-    }
-
-    fixedWalls      
-    {
-        type            zeroGradient;
-    }
-}
-
-// ************************************************************************* //