- removed operator* in favour of operator() for consistency with tmp
    class. The previous use of operator() for const casting didn't work
    anyhow due to template confusion.
  - added xferCopy(), xferMove() and xferTmp() template functions instead
  - preliminary changes to IOobjects and Fields for xfer

Conflicts:

	src/OpenFOAM/containers/misc/xferI.H
	src/OpenFOAM/fields/tmp/refCount.H
	src/OpenFOAM/memory/refCount/refCount.H
	src/OpenFOAM/memory/xfer/xferI.H
	src/finiteVolume/fvMesh/extendedStencil/extendedCentredStencil.C
	src/finiteVolume/fvMesh/extendedStencil/faceStencil/faceEdgeCellStencil.H

  - consistent constructors and consistent behaviour with MUST_READ,
    READ_IF_PRESENT