Version 0.16: networking

Version 0.16 of the Alphaserver ES40 emulator has been released. Besides a few performance improvements, the biggest new feature is network support. An emulated DE500BA NIC has been added.

Things that work:

* Booting (both conversational and non-conversational)
* DHCP
* Telnetting into the emulator
* SET HOST into the emulator

Things that don't work:

* OpenVMS installation procedure