write config file ignores "store actions"

[alon-dotan-starkware]

example:

from configargparse import ArgumentParser


if __name__ == '__main__':
    base_parser = ArgumentParser(
        add_config_file_help=True,
        description='test',
        args_for_writing_out_config_file=['--generate_config_file'],
        args_for_setting_config_path=['--config_file'])
    base_parser.add_argument('--genome_7', default='bla', help='path to genome file')
    base_parser.add_argument('--genome_1', action='store_true')
    args = base_parser.parse_args()

python tester.py --generate_config_file /tmp/config.ini
cat /tmp/config.ini

genome_7 = bla

[bw2]

That's a bug. A PR to fix this would be appreciated.