added some new mappers.
board FK23C is working.
started mapper 116.
fixed ppu palette writes.
small fixes in scroll updating and $2005/$2006
updated todo list.
cartdb working.  needs testing.
added new mappers.
hacked in video filter common code.
added win32 cheat dialog skeleton.
played around with filters/sound systems.
added new mappers.
added new mappers.