Fix crash with 8x8 grid.
Begin to justify moving towards using a movemap.
Add some explanation and equations which can calculate how many guesses were required to arrive at a particular row section answer.
Currently only worked through it for row sections of length 2 and 3.
Will hopefully expand and generalise.
Merge branch 'master' of https://github.com/JasonStephenson/sulver
Some analysis for kakuro_solver_brute_force.
Worked out some expected answers (without) ordering for the first couple of row sections