Adding many census-support utilities.

Fixed extra re-calc of aggregates in presets.
Fixed specialization vs transfer caching error.
Documentation.
Capped interpolation to play well with partial value specialization (aka 'enhance' button)
Enhance button in demo app.  Includes renderAgain added to display system.
Demo app subset & enhance work.
Additional items for demo.
Reduced temp object creation in waiting.
Documentation update.
Fixed specialization error.
Removing dead code.
Adding hashcode to match equality definition.
Documentation.
Updated presets for better US Census visualization.
Merge branch 'master' of github.com:JosephCottam/AbstractRendering
Removed duplicate entry creation.
Advise does near-difference for undersaturation, used in presets.
Fixed subset cached-vs-uncached indexing discrepancy.
Comparable in over/undersaturate.
Generalized to byteBuffer-backed encodings.