TWIT Multi Thread Works!!!!!

Ok,
I got multi threading into TWIT C.  It can have any power of 2 number of threads in the set of 1,2,4,8,16,32,64,128,256.

On my machine at 8 threads it is 0.49 milliseconds per twit on my benchmark.

The core is now done and unit tests pass.

On to Cognate, SRS, and NuTank.....

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