First steps to getting os8-run working with Python 3: this is all of the
print() calls.  (print() is a function in Python 3, not a keyword as in
prior versions, so it requires parens around its arguments, always.)

This is the start of a new branch because this won't be the only thing
needed to get these programs working under Python 3.

This is needed on my macOS box because Anaconda Distribution installs
Python 3 as "python", which is arguably wrong, but hopefully we can get
os8-run and its helper libraries into a state where they run on both
versions so this won't matter any more.

This checkin *also* accidentally includes a SIMH update, because I was in the middle of the SIMH update and got distracted by fixing the Python 2-isms and accidentally checked the SIMH changes in as well. The SIMH update should have been on trunk only. I'll fix that on this branch a bit down the line.