BUG: Need to ensure range of threads are integer values.
ENH: Improved registration parameters for optimization.

the old ants parameters could now be time optimized by taking advantage
of new ants features.
STYLE: Remove aliasing that was confusing

In general unnecessary aliasing should be avoided.  The maintenance
of code with aliases has proven to be much more difficult than
simply using the fully qualified names.
ENH: Added debugging info.