Add a new chronological way to display markers in the marker chart

[julienw]

Currently we display markers sorted by their names. Instead we can try different things:

• in each category, sort by time (use only one big "marker timing" chunk for each category)
• sort by time in the whole chart (use only one big "marker timing" chunk). For that one we'd also want to use the category colors to draw markers.

The goal is that we could see pyramid-like shapes for dependencies (eg: DOMEvent triggering reflows).

A last idea is:

• have a waterfall-like view (one line for one marker, like we do for the network chart). We could maybe reuse the network chart component for that one. Also this could eventually replace the marker table?

We would be able to switch between these views using radio buttons or a select box.

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