Lexicase selection implemented incorrectly

[JackKenney]

From Bill's paper on E-lexicase selection:

"Lexicase selection is a parent selection technique based
on lexicographic ordering of test (i.e. fitness) cases. Each
parent selection event proceeds as follows:

1. The entire population is added to the selection pool.
2. The fitness cases are shuffled.
3. Individuals in the pool with a fitness worse than the
   best fitness on this case among the pool are removed.
4. If more than one individual remains in the pool, the
   first case is removed and 3 is repeated with the next
   case. If only one individual remains, it is the chosen
   parent. If no more fitness cases are left, a parent is
   chosen randomly from the remaining individuals."

[JackKenney]

See figures/lexicase...png for visual description of algorithm

[JackKenney]

Actually, this isn't fixed yet.