Optimistic Backjumping #183
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Fixes #180
Implements an optimistic backjumping strategy where it is assumed to be logically sound unless a Resolution Impossible is hit, then reverts back to the state where optimistic backjumping first diverged from regular backjumping/backtracking, and tries again. This speeds up a lot of scenarios, but isn't a 100% win.
I would like to add tests similiar to #158 as not to regress with any future improvements, I will see if I can figure out some.