[Bug-gnubg] Multithreaded rollouts

[Jonathan Kinsey]

I've made the rollout code multithread, I've left a copy of the old code
so compiling with USE_MULTITHRAED=0 should be the same as before.

It was quite straight-forward, I've made each thread do trials
independently, it just took a bit of thinking about which trial each
thread was doing.  One thing I didn't do was the catching up of a
candidate if it fails back within a jsd range (I doubt this is
important, it could be done if it is).

I was amazed that the results of a couple of tests were exactly the same
(single/multithreaded) and got a bit under 90% speed improvement on a
dual core machine.

As this is reliant on the previous code, it probably won't work on linux
at present.

Jon

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