Add new jobs even if there was no failure.
Fixed ConcurrentModificationException.
WeightCreator should be a bit smarter.
Added test cases for SmartWeightManager.
Handling failing and non-failing separately.
Deprecated SmartWeightManager.
Switched to using SmarterWeightManager, and removed parameter beta.
Report phi rather than beta. Also, tolerate xi not existing, since it
depends on the particular CrossingManager.