[hwmmwrzk] Permutation optimizer

Create a generic routine that maximizes a given objective function over permutations.  This almost certainly already exists.

Optimizations: quickly calculate an updated function given the delta (operation) from the previous state, e.g., a swap.  Store wisdom between successive calls to the objective function.  Forbid inserts and shifts if they are a priori known to be bad operations.

Perhaps also all possible trees.