Remove unneeded partitioning techniques, bug fixes, better benchmark script

* Removed Node & Sym partitioning techniques (All was already removed).
* Benchmarks are now averaged across 5 runs (vs. 1 run previously).
* In case benchmark files have changed they are recompiled prior to their 5 runs.
* Removed references remaining to Doubleton constructor.
* Unbalanced benchmarks get a 4GB stack.