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Fix RINEX files that contain micro sec jumps in phase and range observations
   The error in the original is -45 microseconds, leading to an error in E in 
   northern mid-latitudes of (+) 20-60 mm.
  
USAGE:  sh_fixash -year <year>
  
        <year> year of data to be checked
  
EXAMPLE: sh_fixash -year 1994
 
Codeless receivers identified by ASHL12 in ../tables/station.info
Script should be run in the rinex data directory
  
OUTPUT: OLD rinex file copied to directory ASHL12, FIXED rinex file has original name
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