Static Graphs: Display min and max values in evolution graphs #3396

See attached file.

Labels should include the plotted metric :

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pChart2 does not currently support customizing labels. In particular, it is not possible to :

• remove the border
• remove the square icon
• specify a different font color

The code used to generate the example is available and commented here

Attachment:
minandmax.png

It looks quite good!

• is it possible to change border color to white?
• if we implement this, I wouldn't display the min or max when they're 0

update source file ref

see #3794