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improve heuristic for setting colormap limits in plotter.map

Joseph Weston requested to merge jbweston/kwant:plotting/colormap-heuristic into master

Previously we used the matplotlib default behavior of setting the colormap limits (vmin and vmax) to the limits of the plotted data, if they are not provided by the user. Now we set the colormap limits to the 2nd and 98th percentile of the input data, and stretch the limits by 10% on either end in an attempt to include all the data in the limits. If we cannot do so we set the limits to the percentiles and issue a warning.

Also, whenever the data falls outside the colorbar limits (even when the latter are set by the user) we set the appropriate ends of the colorbar to be pointy, indicating that the data extends beyond the colorbar.

Closes #183 (closed)

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