Parallel processing of simulations by LDhat

[James-S-Santangelo]

Depends on completion of #6

Need to simultaneously process all simulations (i.e., the .sites and .locs files) using LDhat to obtain the population-scaled recombination rate (rho) for all parameter combinations.

If I remember correctly, LDhat requires user input at multiple steps, but we'll want to circumvent this for parallel processing on the server by providing the inputs as optional flags to LDhat at runtime.

I think LDhat also writes its output to stdout, which we'll want to redirect so it can later be parsed to give us rho

[James-S-Santangelo]

Closing since no longer using LDhat