==========================================================================================
 Check either j-file, g-file or sp3 file to ensure session.info has the correct satellites
  
  USAGE :    sh_check_sess  -sess <doy> -type <type> -file <name> 
  
          <doy> is the 3 char doy of the session to check
  
          <type> file type to be checked (sp3, gfile or jfile)
  
          <name> name of the orbit file to check against session.info
  
  Examples :   sh_check_sess -sess 281 -type gfile -file gigs96.281
               sh_check_sess -sess 281 -type sp3 -file igs08741.sp3
               sh_check_sess -sess 295 -type jfile -file jpgga6.295
==========================================================================================