Merge pull request #6 from ericfischer/master

BSD awks, and one from 1996
Pull this test directory out, since `versions/` only tracks the main source.
Fix typo.
Update the README.
Acquiesce to the fact that history isn't linear.
Rewrite the intro.
More README updates.

* Killed the "references" section, since that's been obsoleted
  by the README in versions/.

* Expanded and rearranged the acknowledgments. (Eric gets a promotion.)
Markdown eludes me.
Tweak to build-latest.
Remove pesky dead link. I am okay if history doesn't remember this one.
Clear out the latest/ directory. (via build-latest)
1979-02-16. (History generated via build-latest)
1979-12-30. (History generated via build-latest)
1979-05-16. (History generated via build-latest)
1983-12-10. (History generated via build-latest)
1979-11-30. (History generated via build-latest)
1980-04-11. (History generated via build-latest)
1983-09-26. (History generated via build-latest)
1983-12-09. (History generated via build-latest)
1986-06-05. (History generated via build-latest)