Running in MAME will be easier in Beta2

Running Beta2 in MAME will be more straightforward. There will be no need to 'masquerade' as puzzledp or joyjoy, and the game can happily coexist - with perfectly recognisable filenames (ie 'xevious') - with all the other neogeo/ngcdz games.

Thanks to Blastar for taking the trouble to run me through it and even produce a .xml file for me!