[GRASS5] display multiple answers' default

Hi developers,

G_parser() displayed usage of opt->answer only before.
As i was adding new features to d.pan, i did see opt->answers usage didn't
work at all.

Now you can display multiple answers default values.

  char *def = {"One", "Two", "Last", NULL};

  opt->multiple = YES;
  opt->answers = def;

  G_parser();

It's simple. Don't forget last NULL value.

See d.pan/main.c source for reallife example.

Best Regards,
Huidae Cho

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