[LNT] add simple baseline graphing

[Chris Matthews]

This patch adds a visual representation of baselines to the graph page. When passing a "baseline.<n>=<run_num>" argument to graph, a horizontal baseline will be drawn on the graph derived from the run id passed. The same test and metric are used for each plot. The baseline is drawn as a thick darker line, in the same color as the original plot. The intended use is to compare something like trunk to the previous release. This setting is off by default.

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