[InterNetNews/inn] c19f00: inews: Add -E, -H, -m and -Y flags

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: c19f002f7cafbfd00bd1e03f22cfad0b2151f703
      https://github.com/InterNetNews/inn/commit/c19f002f7cafbfd00bd1e03f22cfad0b2151f703
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-02-20 (Sun, 20 Feb 2022)

  Changed paths:
    M doc/pod/inews.pod
    M doc/pod/news.pod
    M frontends/inews.c

  Log Message:
  -----------
  inews: Add -E, -H, -m and -Y flags

Add compatibility with other implementations, especially tinews,
shipped with tin (Urs Janßen) and inews-xt (Olaf Titz).

New flags:
  -E to silently discard empty articles (from inews-xt)
  -H to print a help message            (from tinews)
  -m to set the Message-ID header field (from tinews)
  -Y to force authentication            (from tinews)

Accept the following flags from tinews, as no-op:
  -i, -I, -L, -s, -v, -X

Better explain how -x works (prepending a path identity).