Both ChartableBrainordinateInterface and ChartableMatrixInterface no longer inherit ChartableInterface so that a class may inhibit both ChartableMatrixInterface and ChartableMatrixInterface without having any multiple inheritance conflicts.  This is in preparation for implementing WB-388: Add Matrix Chart to Parcel Scalar files.
Resolve WB-388 Matrix Chart Display of Parcel Scalar Data.  The file's data content (matrix) can be displayed as a matrix chart and any maps in the file that are displayed as an overlay are highlighted as a column in the matrix display.
Fix a few compilation warnings from gcc-4.9.0 testing.