Show bar graph of detonations over time.
Add x-axis for timeline.
Add a timeline margin top so the bars don't end at the white background.
Remove unneeded line style.
Add brushing in the timeline.
Remove unneeded log.
Size the bars in the bar chart more correctly.
Don't make the timeline background rect transparent.
Don't move the map when brushing on the timeline.
Make detonation dots not in the brushed range lighter.
Make the overlay actually an overlay.

Resolves an issue with zooming/panning the map with the brush.
Make the cursor always a pointer. No text selection allowed.