Utility interfaces and classes for the JUNG API. These include:

- `Context`: a wrapper for an element in the context of a specific graph
- classes for maintaining edge indices (primarily for rendering)
- `Pair<T>`: an implementation of `Collection` designed for two-element immutable collections
- `Graphs`: facilitates the creation of special delegate types such as synchronized and unmodifiable graphs
- `TreeUtils`: utilities for trees and forests (subtree extraction, grafting, merging, etc.)