Perform full normalization of a traversal

[fyrchik]

Sometimes the result of a combination produces the right but rotated traversal. This is because traversal can start from any side of a figure. Such traversals are considered non-equal when list equality is considered.

This can fixed in 2 ways:

1. Perform full normalization so that traversal rotated to each other have the same normalized form.
2. Implement custom equality predicate which takes rotations into consideration.