Added the library Plotly.
Updated the page Graph to use plotly instead of jQuery.flot.
Note the tooltip window may be closed by left doubleclick on the graph area.
Implemented multiple Y axis, Dates as X axis, cumulative minimum, etc.
OS Laboratory. Huawei Russian Research Institute. Saint-Petersburg
For functions that are being significantly changed, can you add type annotations.
We are trying to slowing introduce types into the system. I realize the original functions did not have them, but now is the time to add them.
That could be in a later commit though, if that is easier.