updated installer for 3 emulations

The newest release, cf_emu, creates 4 desktop shortcuts, for VMware Player (the fastest), QEMU (second fastest), Bochs-2.3, and Bochs compiled from CVS sources. The first two and the last use the 1024x768 image, and Bochs-2.3 uses 800x600 since I couldn't get fullscreen mode to work with that.