[CppAD] Possible bug in CppAD: multithreading

[João Leal]

Hello Brad,

I might have found an issue with the multithread setup in CppAD.
I realized that CppAD must be called once before multithreading setup is
performed, otherwise  an assert() will fail.

I have a attached a file where the issue appears (near copy from
team_pthread.cpp).
This example will only work if team_example() is called one time with
num_threads = 1 before being called with num_threads>1.

Best regards,
João Leal
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