Working chaos-over-ether implementation (in addition to Chaos-over-UDP).
Also rename dpchudp => dpchaos, both in code, files and the device process, since it no longer only supports Chaos-over-UDP, but is more generic.
Update doc for CH11.
This only uses autoconf, not automake or libtool or intltool or whatever.
This also allows easy building of different emulators in different build directories.
I have tested TOPS-20 with pcap|tap+bridge, ITS with pcap|tun|tap+bridge, both on NetBSD and Linux
and hopefully everything still works after the fine-tuning.
