Adds QuickGraph again by compiling the library myself
Formats file
Changes balancing scheme to use height instead of just balance. First step in preparing for double insertions.
Adds temp copy of older version of IBS used for benchmarking
Updates tests with input normalization.
Removes unused imports
Adds some invariants to IBS
Adds the double insertion method.
Adds changes made to the double insertion version
Renames balance variable to rotationNeeded
Revert to the faster of the two IBS versions - the one with out height.