Added DOSbox

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Added 9/16/2012

DOSBox is a DOS computer emulator designed to run old DOS programs. I added it so I could play one of my favorite old DOS games, The Incredible Machine. DOSBox uses a directly specified by the user for its C: drive. Running stuff on DOSBox is not for novices, but it only takes a couple of command lines to get things started. The DOSBox wiki is here.