arguments to ?_create_at_action

[Stan Shebs]

Stanley Sutton wrote:

>In the prep_create_at_action, do_create_at_action, and
>check_create_action, there is an argument, int z, which is not used.
>Does anyone know what it was intended to be used for?  Altitude? Leaving
>space for 3D grids?
>
Altitude, the theory being that if you had something like a spysat
for which line-of-sight mattered, you could bring it into existence
at its usual operating altitude.  In practice of course, all that
altitude support is still unused deadweight...

Stan

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