Refine Performance History Graph

[qinsoon]

Based on the graph in mmtk/mmtk-core#125 and https://github.com/mmtk/ci-perf-kit/releases/tag/0.3.3

• Use revision for X axis instead of day. Every run should show in the graph.
• Make the graphs smaller (ideally we want to show all the benchmarks in one page)
• Put benchmark names above the big number on the right
• Use log scale for X axis (show more details in recent days/commits)
• Calculate 10p moving average of 'standard deviation for each data point'. The gray area should be 10p moving average +/- 10p moving average of std dev.
• Show absolute number for the current data (below the big number)
• The annotation for the best number should be below the line, and the annotation for the worst number should be above the line.
• Add link to the data point.

Added:

• Use triangle (as the marker for max/min points)
• Use triangle as background for the big number
• Show xticks

[qinsoon]

#15 solved most of the issues here. There are a few left:

• log scale X: I am not sure how to do a log-scale x axis that are dense on the left
• add link: plotly (the plot library I am using does not provide support for links. There are hacks to achieve this though. )
• show x ticks: I couldn't figure out how to put x labels on the last subgraphs (by default, the labels are put to the x axis of the first subgraph)