sixDoFRigidBodyMotion/sixDoFRigidBodyMotionSolver: Support restart by caching state in the uniform directory
sixDoFRigidBodyMotionSolver: use point-edge rather than face-cell wave to calculate point distance to surface.

Keep original case as floatingObjectOld

Added sixDoFRigidBodyMotionSolver using septernion interpolation for mesh-morphing

Conflicts:
	tutorials/mesh/foamyHexMesh/mixerVessel/system/fvSchemes

    The standard/previous general symmetry type is now named symmetry
    both in class and lookup name for consistency.  The rigorous
    symmetryPlane type is needed for moving-mesh cases in which the
    motion it constrained by one or two planes.