Management of hyperbilirubinemia

Added a hyperbilirubinemia management tool, based on the AAP 2004 recommendations.

In addition to specifying the Bhutani nomogram risk zone and displaying the phototherapy initiation thresholds, it also displays the exchange transfusion thresholds, and also shows the point plotted on the three different graphs (risk nomogram, phototherapy thresholds, exchange transfusion thresholds).

To consider doing: add date/time of birth and lab draw, rather than entering hours of age.

Easy to do (actually, already done), but probably not much demand: ability to plot multiple points on the graphs, to better visualize trend and effect of therapy.

Note: when plotted, the points on the graph are sometimes a fraction off. This is because the figures as published are not perfectly horizontally / vertically aligned. The error is probably too small to be clinically significant. The reported numeric thresholds should be more accurate.