BUG: PhysicsBasedNonRigidRegistrationMethod test failure on Debian 32bit
BUG: PhysicsBasedNonRigidRegistrationMethod test failure on Debian 32bit

Fix itkPhysicsBasedNonRigidRegistrationMethodTest test failure on
Debian-sid 32bit system. The comparison step has been relaxed by setting
the compareRadiusTolerance to 5.
See issue ITK-3400.

Change-Id: I96eb4b8f4e31726b167b031e6631cd6ec700ad3c

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