SUDOKU version upgrade

Version upgrade:
- added 2 buttons for move history roll back/forward
- removed Reset button
- small adjustments to the interface
- found a bug!   

Something I didn't mention earlier: it's aimed at beginners with the Beginner levels much easier than you'd find elsewhere. This should provide enough fun and encouragement to get to grips with the game. And maybe get to like playing SUDOKU afterall.

All previous download links point to the new version. You can also download here.
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