better benchmark without being too unreasonable on the disk requirements.
Changelog:
1.14 - Automatically stop run if work files are depleted
1.5 - It was pointed out by many (most recently Michael Flaster) that the
pseudo-random number generator was more pseudo than random. After
a review of the literature and extensive benchmarking, I've replaced
the previous PRNG with the Mersenne Twister. While an excellent PRNG,
it retains much of the performance of the previous implementation.
URL: http://www.math.keio.ac.jp/~matumoto/emt.html
Also changed MB definition to 1024KB, tweaked show command
