Add toggle to label all nodes
Change wording of legend option
Add annotation indicators

Add small circles to midpoint of links with additional notes
Styles for link annotations
Fix "clear fixed"

Helper nodes were not being classed with "fixed" so they were not being
un-fixed either, so nodes were still restricted by their handles.
Add tooltips to annotation circles

Need to somehow combine this and the link hovers
Consolidate annotation link and marker tooltips

Would be nice if they would act as one object
Stroke of annotation link and marker combined

Before, either the link path or the annotation circle would be stroked
on hover - now the link path is stroked on hover of either.
Merge in link annotations