update of files for simulating Weihs situation., 'give_behavior' has a new case (Weihs) to give prey and red behavior. 'prey_escape' now needs a version input (full or Weihs)

added 'run_batch_sim', which sets up the parameters for Weihs and runs simulation
merge my previous commit (Weihs batch simulation) with post-processing commit
Started to modify the Weihs batching, but not seeing any minimum distance in the simulation results.  I'm going to jump back to Alberto's earlier version to see what went wrong.  Maybe my code change parameter values that messed things up.
I made some modest changes to streamline the code and ease post-processing.