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  Name:     freadint() - read in an integer from a file
  Usage:    <integer> = freadint(<handle>)
  Params:   integer <handle> - handle from a previous fopen()
  Returns:  unsigned integer equal to two bytes read in low byte/high
            byte notation, -1 for error

 ---------------------------------- Example ---------------------------------

                 handle = fopen("test.txt")
                 mrow = freadint(handle)
                 mcol = freadint(handle)

  Note:     The file pointer is moved ahead 2 bytes. If an error
            occurs a -1 is returned. A integer is in the range from
            0 to 65535 and occupies 2 bytes in the file in low
            byte/high byte notation.