plot_page utility 

/init   initialize the page
  nh=nh
  nv=nv
  nplots=nplots  ; calculates nh and nv automatically.
  /nostamp       ; don't print time stamp
  xspace=xspace
  yspace=yspace
  title=title
  /print
    filename=filename
    /portrait
    /landscape
  /noautoclear   ; no auto send
  /nohidelabel   ; print axis labels on all plots.
/plot   start new plot
/overplot  ???
/send   send page to output device
/next   empty plot?


