NNetSimu 2.1

Version 2.01 brings following some new features and bug fixes:
 * New feature Rotate model
 * New feature Rotate selection
 * Bug fix: Crash when stopping "Find loop" with the ESC-key
 * Bug fix: Crash when defining trigger sound for output neuron

The EEG subsystem has been reworked
 * Bug fix: Saved EEG signals didn't show up in EEG monitor window
 * New feature: Create/delete/move/size EEG sensor commands can now be undone/redone
 * New feature: The delete EEG sensor command is now also available in the context menue of EEG sensors in the main window. Before you had to go to the EEG monitor window to remove a sensor/signal.
 * Improvement: Correlation of EEG sensor in the main window and related EEG signal in the EEG monitor window is now visualized better. If mouse cursor is over sensor or over signal, the sensor and the signal are both highlighted.