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 Find h-files using paths given and link them to the current directory 
 
 Usage: sh_find_hfiles <options> 
  
 Where the following are some of the options avaiable: 
  
 -d <yr day> : yr and day are days to be searched e.g. 1997 153. Required 
 -type <ascii/binary/combined> : type of h-files to find [Default: ascii]
 -net <name> : list of unique parts of h-file names to search for. Required.
 -hpth <path> : top directory name to search under [Default .].
  
  Example: sh_find_hfiles -d 1999 125 -type combined -net SIO -hpth /data26/tah/SIO_GLX
           sh_find_hfiles -d 2000 100 -type asci -net igs1 igs2 eura -hpth ./ascih_2000
           sh_find_hfiles -d 1999 250 -type binary -net tubi -hpth ./binh_2000
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