Added first reaction-diffusion protocol: Diffusion dependent coloring.

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user: Michael Guravage <michael.guravage@cwi.nl>
branch 'default'
added data/leaves/myleaf.xml
added src/protocols/MyDiffusionModel/Makefile
added src/protocols/MyDiffusionModel/mydiffusionmodel.cpp
added src/protocols/MyDiffusionModel/mydiffusionmodel.h
added src/protocols/MyDiffusionModel/mydiffusionmodel.pro
changed src/protocols/Makefile