- 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.