Add network loot disk

I worked at simple networking API and it is finally done. It is/will impement features from #536.
Features for now:
* Automatic route discovery, routing
* Drivers for modem and tunnel(Linked cards)
* Multiple names/addresses for host(+ability to define own)
* TCP and UPD like protocol(for connecton and connectionless data sending)
* ifconfig utility that looks pretty much like the original one
* Simple netcat and ping
* API documented in man file(network)

To try it just put floppy and run installNetwork on computers that you want to connect. For now you have to rebot when you change network components of computer(reboot only one host to be clear)

I've also added --fromDir option to install so there is no need to implement --exclude which would be way more complex.
Well, yes. You assign it to `installDir`, but you don't use `installDir`, do you?