* lisp/net/nsm.el (nsm-check-tls-connection): Fix issue with plural
problems in message. Prefix every problem with a bullet.
(nsm-query-user): Add new view the full certificate chain by
pressing d.
(nsm-format-certificate): Improve basic certificate and session info
formatting.
* src/gnutls.c (emacs_gnutls_certificate_export_pem): New function.
(gnutls_certificate_details): Rename to
emacs_gnutls_certificate_details. Add :pem to result list.
(Fgnutls_format_certificate): New function for formatting a PEM to
human-readable text.