ENH: Reg Tuner: Control image planes.

Change-Id: I003d6cc6e94b3f942135e0b002f33da96fd4fdfd
ENH: Reg Tuner: Display tube colors.

Change-Id: I1c34ec9d95bbe49549a25fc0d832137b929c9b04
ENH: Reg Tuner: change the config at runtime in the Python console.

Change-Id: I2c185e34dcd4fe31e6667cd9f87149b9af295735
WIP: BUG: ImageToTubeRigidMetric computation Bug?

Change-Id: If1a3302e53e4ea2e910452bf3ff0376fa4add7b9