sixDoFRigidBodyMotionConstraint: rewritten as direct constraints on the velocity

src/sixDoFRigidBodyMotion/Make/files

...n/sixDoFRigidBodyMotion/constraints/fixedAxis/fixedAxis.C

...n/sixDoFRigidBodyMotion/constraints/fixedAxis/fixedAxis.H

...n/sixDoFRigidBodyMotion/constraints/fixedLine/fixedLine.C

...n/sixDoFRigidBodyMotion/constraints/fixedLine/fixedLine.H

...odyMotion/constraints/fixedOrientation/fixedOrientation.C

...odyMotion/constraints/fixedOrientation/fixedOrientation.H

...sixDoFRigidBodyMotion/constraints/fixedPlane/fixedPlane.C

...sixDoFRigidBodyMotion/constraints/fixedPlane/fixedPlane.H

...sixDoFRigidBodyMotion/constraints/fixedPoint/fixedPoint.C

...sixDoFRigidBodyMotion/constraints/fixedPoint/fixedPoint.H

...gidBodyMotionConstraint/sixDoFRigidBodyMotionConstraint.C

...gidBodyMotionConstraint/sixDoFRigidBodyMotionConstraint.H

...BodyMotionConstraint/sixDoFRigidBodyMotionConstraintNew.C

...aints/linearAxialAngularSpring/linearAxialAngularSpring.C

...aints/linearAxialAngularSpring/linearAxialAngularSpring.H

...DoFRigidBodyMotion/restraints/linearSpring/linearSpring.C

...DoFRigidBodyMotion/restraints/linearSpring/linearSpring.H

...RigidBodyMotionRestraint/sixDoFRigidBodyMotionRestraint.C

...RigidBodyMotionRestraint/sixDoFRigidBodyMotionRestraint.H