man pages for new tools

  * at least describe `tlspool-chat-client`, `-server` (and `-peer`?)
  * might preview `gsspool-chat-xxx`, `sshpool-chat-xxx`
  * at least for `tlsclient`, `tlsserver` (and `tlspeer`?)
  * might preview `gssclient`, `gssserver`, `sshclient`, `sshserver`