Organize SVG to place text over all other elements.

[josiah-wolf-oberholtzer]

Because of SVG's implicit z-ordering, text elements would need to be moved out of all node groups and then translated separately (and therefore kept in sync with the nodes), based on the node motion.

[josiah-wolf-oberholtzer]

Organize contents of SVG into multiple groups:

• Background
• Edges
• Node circles
• Node text

[josiah-wolf-oberholtzer]

Done.