Merge pull request #42 from OpenTreeOfLife/provenance-display

Improved placement (and tooltips) for panel toggle buttons.
Separating 'Taxonomic rank' display from source taxonomies.
Added large triggers to restore argus view (PHONE)

This is added behavior for small screens only. If the main argus view has been marginalized by showing the comments or properties panels, clicking on the visible sliver of argus will restore it to center stage.
Zoom behavior (and UI) for argus view.
Merge pull request #43 from OpenTreeOfLife/argus-zoom

Zoom behavior (and UI) for argus view.
Converted all stroke-width properties to integers (in px).

This restores the super-fat invisible strokes that act as triggers for
edge provenance. I'm not sure how this ever worked... :-/