add a shell script to build readable docs
new (unpublished) version

- fix entity reference URLs
- title draft to include abbreviation
- target sunset4
- use work address
- reflow paragraphs to terminal width of 78
- add vim modeline
- strip down main architecture fitgure basics, instead include a
  fuller example in the appendix
- Incorporate suggestions and corrections from Cameron Byrne, Lars
  Olafsen, and Dagfinn I. Mannsåker
- Various other textual improvements
New draft: anderson-siit-dc-2xlat

For using an host agent to do reverse translations à la 464XLAT's CLAT.
This allows more NAT-unfriendly applications such as FTP, as well as
IPv4-only applications, to work correctly in an SIIT environment.
add human readable versions of the drafts