add tun class, and wonky integer get/set for IPv4 addr
add tun class, and wonky integer get/set for IPv4 addr


git-svn-id: 935794000d934034fad4bb4152be248a7507e5ff@527 0c474577-fa26-0410-a966-bdb198e94e9e

hellais/libdnet,hellais/libdnet,hellais/libdnet,hellais/libdnet