Heat equation: code improvements

This is a 64x64x8 example. The core function does not differ much from the last example, but it is now possible to repeat the events a number of times; matrix allocations are done before-hand, which should improve processing time.
In this example (which iterates x5 times the regular rate) a pulse of heat is given to the center of the target every 20 seconds for 10 seconds, repeated 4 times.
Time units are nanoseconds and space units are centimeters (1E-2 meters) and the material properties are supposed to be those of aluminum.

Update: code now available - http://www.geocities.com/wombofwoe/

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