****  1.0 -- adl parser
                              Goetz Pfeiffer 2005

  options:
    -h: help
    -f [file], neither -i not -f are given, read from stdin
    -b : replace existing file, make a backup
    --dump -d : dump internal parse tree to stdout
    --perldump: dump perl-compatible parse-tree
    --import -i [file]: import data from perl-dump file
    --debug: used to debug this script
    --legacy: allow old-style meta-commands in *.cdl files
      (like #if and #endif)
    --new-sort: use new sorting method