Reorganised the memory-management classes.

src/OpenFOAM/memory/autoPtr/autoPtr.H

src/OpenFOAM/memory/autoPtr/autoPtrI.H

src/OpenFOAM/memory/tmp/refCount.H

src/OpenFOAM/memory/tmp/tmp.H

src/OpenFOAM/memory/tmp/tmpI.H

src/OpenFOAM/memory/xfer/xfer.H

src/OpenFOAM/memory/xfer/xferI.H