ENH: Reg Tuner: Show the center of rotation.

Change-Id: I74d30dfcd88cf89b12347fe246d99f5851cbdcb3
ENH: Reg Tuner: Visualization tube movement over registration.

Change-Id: I3fcbe115317dd43b7f1753fcb1931d6621a550ab
ENH: Reg Tuner: Add plot of tube center translations.

Change-Id: I3f446253173c8e018b3e4867f37172a80ac50901
BUG: Reg Tuner: rotate around tube center.

Change-Id: Ie07ead20ccbdd063083ac5ffef49f1f6ab984c65
ENH: Reg Tuner: Plot metric values.

Change-Id: I5ca4a20f236bfedb7179620012f74298a3264666