- make the 'dist-hook' from top-level Makefile work again.
  - we can find my_print_defaults from --basedir by parsing command
    line arguments prior to running my_print_defaults.
  - take advantage of additional command line parsing and allow the
    --no-defaults etc arguments to work anywhere rather than having
    to be the first argument.
  - find SQL files either from binary archive or source install.
  - consolidate and tidy code and error messages.


scripts/mysql_install_db.sh:
  Consolidate error messages.