(MESS) gamegear: added preliminary emulation of the Master Gear Adapter 
which allows to launch SMS games in the gamegear driver, with video chip
in SMS mode. You can try this by launching
  mess.exe gamegear -cart mgear -cart2 your_sms_game
(the -cart2 switch becomes available when you mount "mgear" in the main
gamegear cart slot) [Fabio Priuli]

out of the whatsnew: for the moment only fullpath loading is supported, and it is not
ensured to work 100%. thanks to Enik Land for pointing me to the necessary info.