initial upload

cookbook/simple_tess/simple_tess.bat

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+:: Generate a regular grid, pipe it to all the computation programs,
+:: and write the result to output.txt
+
+tessgrd -r-45/45/-45/45 -b101/101 -z260e03 | ^
+tesspot model.txt | ^
+tessgx model.txt | tessgy model.txt | tessgz model.txt | ^
+tessgxx model.txt  | tessgxy model.txt  | ^
+tessgxz model.txt  | tessgyy model.txt  | ^
+tessgyz model.txt  | tessgzz model.txt -v -llog.txt > output.txt
+
+:: Make a plot with the columns of output.txt
+python plot.py output.txt 101 101