added method to calculate original indexes in non flattened case based on flat index and original shape; altered report to show subgroupings and image generation to put bin/tuple images into subgroupings by bin; fixed case number on the line plots

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@102 8a9318a1-56ba-4d59-b755-99d26321be01