#67 Implemented the feature to skip back animation ...

based on MagnetRONFrame#skipBackAnimation() (may be  thread bug).
Added SkipBackAnimationAction.

#67 Implemented the feature to fast forward animation ...

based on MagnetRONViewer#animationSpeed.
Added FastForwardingAnimationAction class.

#59 Fixed a bug in auto-tracking animated cells so that the window could ...

be scrolled when the graph was expanded.

Forgot to commit at point enabled to change the language.

Enabled to change the language of names such as MenuBar.