Arcs, Matrices & accessor index

Features

• In XYFrame, points and lines are decorated with xIndex, yIndex, lineIndex corresponding to the array position of xAccessors, yAccessors and lineAccessors. Likewise, OrdinalFrame decorates pieces with rIndex and oIndex which correspond to which of the accessors generated them.

• NetworkFrame has a new matrix type that creates an adjacency matrix.
  

• NetworkFrame has a new arc type that creates an arc diagram.