- Fixed problem where urgency was not properly calculated for waiting tasks.
- Tweaked urgency coefficients to make most of the values closer together, and
therefore more sensitive.
- Inverted 'waiting' coefficient.
- Boosted 'next', 'due' and 'blocking' coefficients.
- Modified unit tests accordingly.
- Lessened the impact of 'blocked', 'project', 'tags' and 'age'.
- Annotation timestamps are now incremented until unique. This prevents
rapid, successive annotations colliding. The kind that occur during
unit tests and when using UI wrapper programs.
- Removed 'sleep' commands in unit tests that were added to circumvent
this. This speeds up the test suite somewhat.
- Corrected unit tests for urgency.
- Modified default 'blocked' coefficient to be negative, to compensate
for the bug fix for #707 that inverted the test.
