add attachment ability to archiver
add attachment ability to archiver

chen-chan/nntpchan,chen-chan/nntpchan,majestrate/nntpchan,majestrate/nntpchan,chen-chan/nntpchan,chen-chan/nntpchan,chen-chan/nntpchan,majestrate/nntpchan,chen-chan/nntpchan,majestrate/nntpchan,majestrate/nntpchan,chen-chan/nntpchan,chen-chan/nntpchan,majestrate/nntpchan,majestrate/nntpchan