1 09/14/79  remove_graphics, rg
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 3 Syntax:  rg {switch1 ... switchN} {-control_args}
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 6 Function:  Detaches the graphics I/O switches attached by setup_graphics.
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 9 Arguments:
10 switchI
11    are names of specific graphics I/O switches to detach.  (DEFAULT-- all
12    graphics I/O switches attached by setup_graphics.)
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15 Control arguments:
16 -all, -a
17    specifies that all graphics I/O switches attached by setup_graphics are to
18    be detached.  (DEFAULT if no switchI arguments are given)