(MESS) nes: added support for iNES 2.0 submappers [Fabio Priuli]

out of whatsnew:
+ fixed a small bug in handling MMC-1 games with > 8K of WRAM (only a Jpn baseball games use this, 
   and I can see no difference in behavior)
+ updated emulation status in xml for a few games I had made working during slot-ification