- Restructure the code

- Restructure the code
- Update functions to ANSI style
- Remove register
- Make variables const
- Remove filename, unnecessary (we can use argv)
- Avoid repeated checks on *argv
- If ferror returns an error, we must reset the error indicator
  with clearerr(). We must do this incase another error occurs
  on file ++argv
- Add WARNS 6
- Static functions
- Add $DragonFly$ tag to Makefile

OK'ed: Joerg@