moveoff: not_done_yet note for addf work needed

Signed-off-by: Dewey Garrett <dgarrett@panix.com>
moveoff.comp: Separate functions for read, write

servos need to properly sequence reads and writes so add
functions for moveoff.comp: read_inputs(), write_outputs()

This requires additional changes to demo examples:

hookup_moveoff.tcl:
    Find the thread with the motion functions (motion-command-handler
    and motion-controller) and addf read-inputs and write-outputs
    to proper order.

removeshort.hal  (renamed from noshort.hal)
    remove simulator 'shortcircuit' connection between pos-cmd
    and pos-fb and replace with pid component with zero gains
    and FF0=1 to pass-through input to output.

Signed-off-by: Dewey Garrett <dgarrett@panix.com>