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  Merge part-day RINEX files into single-day (0-24 UTC) 
  
  USAGE :    sh_merge_rinex  -site <station> -year <yr> -days <doy> -int <sampling> -obs <max_obs> 
 
      Required: 
  
          <station > is the 4-char id of the station to be merged 
 
          <yr> is the 4 char year of observations
  
          <doy> are the 3 char days of the year of observations 
  
          All sessions (1,2,..) on a day will be merged to output session 0
 
      Optional: 
 
          <sampling> is the output sampling interval in seconds [default 30] 
 
          <max_obs> is the maximum number of observables to write (L1, L2, P1, P2, C1, D1) 
                    [default is to use all ]
  
  Example :   sh_merge_rinex -site koke -year 1996 -days 016 017 
 
 
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