support interactive scroll, disable websocket.
support changes in update frequency.
add min/max ylimits and log scale on y-axis.
serve svg and config urls, disable websocket / hub.
remove collector argument to startCollectorServer.
add usetime arg to NewFigure & Figure struct.
add usetime to Collection, and Ylimits to Axis.
add ylimit and yaxis command line arguments.
use css comments
update generated sources.