Remove these comments.
Instrument number of transactions.
Add node difference instrumentation.
Plot thread_transactions, all_transactions and node differences.
Fix script problems.
Use initial priority for nodes.
Revert "Use initial priority for nodes."

This reverts commit 8d800e1a3c7ce4d1d7dde474e5132e51a34449c1.
Set a max initial priority.
Fix bug.
Fix another priority bug.
Solve concurrency issues in runtime objects.
Simplify slice/stat.
Add more 8 queens versions.
Merge branch 'dev' into compiler
More parser fixes. Parse :(...). Include default predicates.