Hello,

I've added a new (gnu packages emulators) module. As a result a few
existing packages from (gnu packages games) should be moved over.

At first glance, this includes:
desmume
dosbox
emulation-station
higan
mgba
mupen64plus*
nestopia-ue  
retroarch

I'm a little unsure about how to handle the existing copyright notices
however. What's the usual procedure for moving packages over?