Change TreeNodeClass.Plot method accept source/detector/datatype instead of...

Change TreeNodeClass.Plot method accept source/detector/datatype instead of single number index  (#151)

v1.64.0

-- Fix DataTree/setpaths not deleting other DataTree repos from path.
-- Change TreeNodeClass.Plot method accept source/detector/datatype instead of single number index vector, and handle multiple plot figures.
-- Reorganize and add documentation for TreeNodeClass plotting methods under separate methods section.
-- Redo LoadRunPlotExample (rename from LoadRunPlotExample1.m and delete LoadRunPlotExample2.m)  to display multiple plot figures.