BUG: Remove old copies of the ImageToTubeRigidMetric and Registration.

The changes in the "2" versions of these classes were incorporated into the
original classes.

Change-Id: I22d798f35bf0020fd63f03d710a2ffb39d50419b
Merge topic 'WarningsMemoryLeaks'

37efd5c BUG: Remove old copies of the ImageToTubeRigidMetric and Registration.