Got a color transfer function working -- shows a vertical bar to the right with colors for values.
Do not have different colors in the actual histogram yet.
Got some different colors displaying for different data.  Is basically 1-D though - need to "add the other dimension" really...
Wrote logic for a 2D "VTK histogram" array.  VTK code for it is part done.
Got a meaningful histogram displaying in VTK (just need to make it zoom out by default if possible and look into # bins)
Made number of bins variable.
Made cuda/windows timing work across multiple method calls
Made number of variables used truly configurable - it now skips the respective columns when reading the file.
Got CPU method working again, though it only works with small data sizes and small numbers of variables - otherwise an out of memory exception occurs.
Fixed overflow issue by using long long type.  Corrected mins and maxes vector.
Minor code cleanup, mostly comment related.
Fixed one more overflow problem with the map reduce part