"trampoline" isn't a good term, replace it
various updates

- move section that compares siit-dc with other types of network
  deployments to an appendix, and reformat it somewhat (thanks, ross
  chandler)
- ensure the same addresses are used in examples in both documents so
  that they can seen as complementing each other
- fix preambles and <t> tags, especially around in the packet flow
  section
- other improvements all over