Added to new menu options: edit->ResetChemicals and edit->ResetTransporters, which allows you to set only the chemicals or only the transporters to the initial values. I needed this for preparing a suitable initial condition for Tutorial 6 and thought it would be useful for the main distribution.

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user: Roeland Merks <roeland.merks@cwi.nl>
branch 'default'
changed src/build_models/Makefile
changed src/canvas.cpp
changed src/canvas.h
changed src/mesh.cpp
changed src/mesh.h