This is the first commit I do entirely in VE. It's a habit I'm planning
on taking as it helps a lot to find usability issues.

AGAIN, becomes a shortcut for "' RJMP AGAIN?,"

I decided to keep SKIP, .. TO, (renamed from AT,) around and limit
IF, .. THEN, to the simple BRNE case.

Will change to IF, .. THEN, but I need a way to easily reverse a
BR op. But from this commit, the translation of sms/kbd/ps2ctl.asm
is complete! perfect binary match!

Still making great progress on sms/kbd/ps2ctl. Still matching ref
binary.

Getting good! still advancing on ps2ctl in sms/kbd and still
matching reference binary.

This will make it easier to fit BR* in there.