core: New internal option --dump-option-table for argparser.
* src/argparse.c (initialize): Add new internal option. (arg_parse): Implement that option. (dump_option_table): New. (show_help): Remove exit and let the caller call my_exit.
This options allows us to get a copy of the option table.
- Signed-off-by: Werner Koch <wk@gnupg.org>