Bit of visual tweaking on view-line

Reduce visual noise due to circles, show full SExp in caption, opacity.
x/t guides for view-line
Reduce distractingness of guides
Allow reducing functions in view-histogram
Get rid of errant console.log()
Preparation for adding area, color to view-plot
Area and color for view-plot

which should help make this a bit more useful.
Hack to allow color without area in view-plot
Adding crossfilter to datafist

so I can use it for another view.