[InterNetNews/inn] 720a6f: Refuse headers with a leading dot in OVERVIEW.FMT

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 720a6f9ece51ddcd735d44ce8d34b6e7f8435a38
      https://github.com/InterNetNews/inn/commit/720a6f9ece51ddcd735d44ce8d34b6e7f8435a38
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-12-09 (Sat, 09 Dec 2023)

  Changed paths:
    M lib/innconf.c

  Log Message:
  -----------
  Refuse headers with a leading dot in OVERVIEW.FMT

Header field names beginning with a dot can no longer be added in
the extraoverviewadvertised and extraoverviewhidden parameters of
inn.conf so as to fix problems of searches and dot-stuffing (in LIST
OVERVIEW.FMT responses).

This is not (yet) supported in INN, and as this use case does not
happen in real life, do not bother supporting it.

see #286