MotionStatus gets a Motion's
(motion) status and writes it to the structure pointed
to by status, and also writes it into the implementation-specific
structure pointed to by external (if external
is not NULL).
The Motion's status information in external is in
addition to the Motion's status information in status,
i.e., the status information in status and in external
is not the same information. Note that status or external
can be NULL (but not both NULL).
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