Branch of FCEUX where I implemented a couple of extra features

• user defined "base directory" for Linux builds. Yes. Now you can choose where the config, save states etc will be stored. Just pass the directory in the commandline using --base-directory
• rotating save states. Each time you press 1, a new save state will be created. And when you press 0, the last save state you created will be loaded. The save states are saved on the regular save state slots (0-9) so, in case of you to go to a previous one, just manually load that state. There are only 10 slots so, when all of them are filled, the emulator will start overwriting the oldest ones.