performance improvements for floating point random number generation

[Marcus G. Daniels]

Thanks to Paul Johnson, the generation of floating point numbers are
now on average 10 percent faster!  This is good news seeing how random
numbers are a bottleneck in many simulations.

The optimizations are in today's snapshot and in today's DLLs:

   ftp://ftp.swarm.org/pub/swarm/src/testing/swarm-2001-04-17.tar.gz

   ftp://ftp.swarm.org/pub/swarm/binaries/w32/latest  

Thank you, Paul!

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