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 Update station.info using header infomation from RINEX file 
                           and/or
 Update station.info by merging and sorting entries from other station.info's
  
 Usage: sh_upd_stnfo -files <files> -expt <expt> -orbt <orbt> -u -nosort -h <slant hgt> -ref <file> -merge <files>
  
        <files> RINEX file/s to be used to update station.info. [Required] 
        <expt> 4 char experiment name used in line 1 of station.info. [Optional]
        <orbt> 4 char orbit name used in line 1 of station.info. [Optional]
        -u     update entry only if it is different from previous one
               [Optional] Default is to add new entry
        -nosort option not to sort original station.info if known to be sorted
               [Optional] Default is to sort station.info
 
        <slant hgt> antenna height (m) above which the height in the rinex will be
               as a slant height.  NOTE: Use with caution; not consistent with
               RINEX standard and is included only for non-standard RINEX files
        -ref   Reference station.info (defines output info and format). [default station.info]
               If not given a default station.info file will be created with the format:
*SITE  Station Name      Session Start      Session Stop       Ant Ht   HtCod  Ant N    Ant E    RcvCod  SwVer  AntCod
  
        NOTES: (1) Station.info file merging are done before entries from rinex files is added.
               (2) The output merged and updated file created is named: station.info
  
 Examples: sh_upd_stnfo -files ../rinex/tubi2400.98o -expt emed -orbt pgga
           sh_upd_stnfo -merge station.info.sopac.newfmt
  
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