Vaccine cross date

[jameshadfield]

Additions

• When the tree is temporal, there are dotted lines from the tip to the vaccine date. For non-temporal trees as well as clock layout the cross is in the same position as the tip.
• Vaccine crosses have the same onClick, onHover, onMouseOver callbacks as the corresponding tip.

Code improvements

• mapToScreen has been sped up by about a third.
• updateGeometryFade now uses a transition counter to fire different steps when the preceding step is finished rather than using setTimeout and guessing how long each step will take.

Regressions

• Vaccine cross styling no longer has a white outline. This is because it has to be drawn as a SVG shape rather than text to have onClick events etc. Could be fixed if the SVG shape was a X rather than a path of two lines.

Screenshots