L10N

- Translated new error.

Signed-off-by: Paul Beckingham <paul@beckingham.net>
Documentation

- Updated docs to highly recommend libuuid.
Unit Tests

- Improved two tests that always fail around summer time clock changes, by
  eliminating the dependence on 86,400.
- Fixed feature.891.t tests that fail on certain fortuitous random UUID
  permutations.  Now hard-coded UUID.
Documentation

- Updated the developer information.
Performance Testing

- Added 'performance' make target that constructs an 8,000+ task database and
  runs benchmark queries against it.