Improve rendering of history graphs

[Kobzol]

When you open the graph history page with a single graph selected (common when coming from the compage page), it would be nice to show the graph over the full page, rather than just in a small box.

Also, some improvements could be made to improve the readability of the graph when it contains a wide range of values (#1936 (comment)).

[s7tya]

is this mean expanding the width of graph to the screen width?

[Kobzol]

Yes, I think that would be nice. At the very least if there is really only a single graph selected, it should expand. Does not necessarily be to the whole screen (not sure if that looks good?), but it should be larger.

[s7tya]

I see. it might be nice to check if both benchmark & profile option are set to determine single graph is selected.
→ Because of previous change, we should check the length of API resp to determine whether single graph is selected or not.