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  sh_make_plate reads an .apr file and generates a plate input file 
  
  USAGE :    sh_make_plate -apr <file> -plate <frame> -override <plate file> 
  
          <file> is the name of the apr file to make a plate file from
          <frame> after creating the plate input file run plate in the given ref frame
                  NOTE: see plate help for list of available frames.
          <plate file> a plate file who's plate enteries override the calculated ones
  
  Example :   sh_make_plate -file itrf97.apr 
              sh_make_plate -file itrf97.apr -plate EURA
              sh_make_plate -file itrf97.apr -override known.plate -plate EURA
 
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