Customize Lynx's filetype behavior

Lynx does the standard thing (unlike Firefox and Chrome) and uses the system's mailcap database. The system mailcap is in /etc/mailcap, and the per-user file is ~/.mailcap. Add entries like

application/x-bittorrent; transmission-cli '%s'; needsterminal
application/pdf; pdftotext '%s'; copiousoutput
application/ogg; vlc '%s'; test=test -n "$DISPLAY"