[11.17.14] neuron (Beta) v.0.027
[11.24.14] neuron (Alpha) v.0.028
adding undo/redo.
- added Command abstraction
- added Command Manager to handle undo/redo
adding undo/redo.
- added Command abstraction
- added Command Manager to handle undo/redo
- added several Commands (more need to be added for complete undo/redo)
- removed neuron type selection
- removed an xml that was not used (also created a new unused xml)