re-revert

Revert "Revert "Button + scale""

This reverts commit 277ddae380311925b3045da8c57c0b51ea8d2f72.
Visual Change

Small change to non-barrier node drawing.
Habitat Summary Area

Added summary area to display the original habitat, the current
habitat, the habitat gain, and the budget.

In progress: debugging behavior of larger network.

Conflicts:
	index.html
	styles.css