Freed Z80 / Some progress

[Steven Hirsch <snhirsch@gmail.com>]

I'm finally able to assemble and link a running PCPICPM image from source 
code.  Man, what a battle.  I was up against all sorts of silliness like ZEX 
(Z-System equivalent of shell scripts) command files that were too old to be 
compatible with my CardZ180 development environment, changes I made to things 
for reasons lost to 20 years of time and corrupted tools.

This will let me create turnkey systems that will boot from ProDOS without the 
need for convoluted bootstrapping.  I also plan to code support for the USB 
port into the BIOS at some point.

I've setup a CVS repository here and am going to track things carefully from 
now on.