[PATCH] [LNT] Teach LNT to plot geomean trend

[Yi Kong]

Hi Chris,

The public perf server has partially moved to PostgreSQL, making heavy
jobs like plotting geomean trend possible.

This patchset teaches LNT to plot geomean, so that we can view the
trend of overall compiler performance over time.

Also there's a minor improvements to the graph UI.

Ok to commit?

-Yi
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