What does motion.motion-enabled do and where is it used?

1. I grep'ed for it in the source and I see where it's created. Looking
at the rest of the source code, it's not obvious where it's used. It
shows up in mot_priv.h, motion.c and control.c.

2. It shows up in the hal status as an input, but I can't seem to drive
it FALSE.

3. I came across this while looking for a way to inhibit motion.

4. The only type of motion I can't inhibit with the usual methods is
homing (motion.feed-hold and feed rate override don't seem to work on
homing).

5. I have a key switch that should disable ALL motion. It works, except
for homing.

6. If there's no other way, I can probably OR all the is-homing
signals, AND that with my-disable-switch-is-closed, and tie that to
halui.abort.

Thoughts?

Thanks,
Matt

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