Changes

==== Z80: ED A9 B9 cpd(r) / ED A1 B1 cpi(r) ====Problem here : CPDR and CPIR has same implementation than ED A9 CPD and ED A1 CPI. Solved by Sorgelig (does not run in r005.8.16.2 but does pass on Sorgelig MiSTer version) In fact it is more difficult instruction that I was thinking, if you watch at it, it shall take only 4 NOPs maximum but in plustest.dsk it does take 6/4 NOPs. In fact C9 RET seem also used here, as sub instruction.