HP-35/45 Simulator for PDP-8

I updated the project to include optional OS/8 support. I won't say I've tested it extensively, but it does seem to be working as expected in SimH, anyways. I updated the README to reflect the additions. The directory structure was also updated to something more sane. The keen observer will note that I also changed up some of the debugging features which are likely to not be useful to anyone other than the author...and even then, I only used the features a few times when getting the thing running initially. But, it's there if you need it, all configurable through the switch register as detailed in the source. Glad some folks got a kick out of it enough to try it out! Feel free to suggest improvements where you see fit. I was thinking about adding support to read keystrokes from a file for macro programmability...but that might be too absurd even for this project. Maybe the HP-41C simulator is next... :) Kyle