Cooling-down and heating-up simulations

Example shell scripts cooling.sh and heating.sh
are in 24x24x24-20000-200000 subdirectory.
The shell scripts takes 1 day with 4 core 2 GHz machine.

Read ../../doc/fluctuation-susceptibility.pdf .
Then, read strain-susceptibility.gp carefully and execute it as
 $ gnuplot strain-susceptibility.gp
