Changed this module to store historical value indexes for each parameter instead of the actual values.  This is more efficient, but more importantly it fixed a bug where copying the last set of values when appending to the list resulted in pass by reference instead of pass by value which destroyed the value history of some parameters.
Changed this module to store historical value indexes for each parameter
instead of the actual values.  This is more efficient, but more importantly
it fixed a bug where copying the last set of values when appending to the list
resulted in pass by reference instead of pass by value which destroyed the
value history of some parameters.

numenta/nupic.vision,scottpurdy/nupic.vision,scottpurdy/nupic.vision,numenta/nupic.vision,numenta/nupic.vision,scottpurdy/nupic.vision