Forgot to include zlim as option for heatmap panel
panelutil.coffee: Add function matrixMaxAbs
Working on new chart: iheatmap
iheatmap: Change default chart size
heatmap panel: Add (i,j) indices to cells
iheatmap: add titles to slice panels on hover
iheatmap: add curves for horiz and vert slices on mouseover
Revise example for iheatmap
Merge devel branch