add start of hawkes MLE #161
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This adds the start of a spatiotemporal Hawkes process estimator. I'm trying to finish the single-dimension case first.
A Hawkes process is a kind of spatially-and-temporally dependent point process. Points that arrive at time t at location s make other arrivals near s and shortly after t more likely. Thus, Hawkes processes are sometimes called self-exciting.
Some existing implementations exist, and I'm hopeful to make both an MLE estimator and a simulator.