Fixed 3049 and 3062.
Support save files which end with ".sav". Notice: If there're ".sav" file and ".nds.sav" files in the same folders, the ".sav" one will be used. And you can't use multi-save file system in this case. If you want to use multi-save file system please modify your ".sav" file to ".nds.sav".
For example: The name of game is "myndsgame.nds". Then you can use save file of "myndsgame.sav". If you want to use multi-save file system then please modify the save file to "myndsgame.nds.sav".
