first cut at full-blown sid playing. sweet_jb marginally works. nothing else. likely just boundary errors in the 6502 implementation
note about current compatability
lower bounds check in cmp
more lower bounds checking
some upper bounds checking
elimination of use of double logical not, as it doesnt work the way it does in c
fix to setflags
signedness handling in branch was wrong, remedied. Last_Wader is now mostly working. No real change to sweet yet. Robocop still not working