sensor interactive: hackily sync duration slider

Better solution would be to have script api to set property range of displayTime
grapher: render after label or title change

It is necessary to render the whole graph in addition to merely changing the contents of the affected DOM elements because changing the visibility of a graph label may force a relayout of the graph. (Say if a yLabel goes from being empty to have some value; the graph has to make room for the new yLabel)