warmup jump+tulip code to save much time later in testing #303
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mainly, this should prevent a situation where worker 1 and worker 2 do the
precompilation sequentially, thus wasting 2*N time instead of just N. Actually,
N is now around 50 seconds, so it saves quite a bit of time. Also, time
measurements are now much less skewed by precompilation.
Closes #287