iterate more machine cycles per loop
iterate more machine cycles per loop

raise Z80 machines cycles per emulation loop to 50000; we're executing many millions per second on my MBP, even compiled debug
change variable name for video to more descriptive "use_352_video_columns"

lkesteloot/alice,lkesteloot/alice,lkesteloot/alice,lkesteloot/alice,lkesteloot/alice,lkesteloot/alice