Add more image processing methods

The different image processing techniques with cellular neural networks can be realized by changing the coefficients of the control and feedback templates.

Significant research had been done for determining the templates needed for realizing various image processing functions. One can refer to this published [template library](http://cnn-technology.itk.ppke.hu/Template_library_v4.0alpha1.pdf) for numerous examples.

Adding these new functions would require adding new template coefficients corresponding to these functions. This would be exactly similar to current functions such as edge detection except the coefficients would be different.

Any suggestions are welcome. Thanks!