Changed flag from include to exclude (as default)
Progress with that monstrosity of a function that is TrailPointer.eachBetween. Will take simpler route, but keeping for posterity (or if it can be recovered)
Adding compulsory index tracking to Trail
TODOs and acceleration hooks for Trail indices
Trail TODOs
Trail copy constructor
TrailPointer forwards/backwards
Unimplementation guards
Forwards/Backwards nested pointer test cases