Implemented object pooling for PlaintextSequence instances.  Removed
calls to super.clone() from WordGene and PlaintextSequence.  Updated
removals from Lists to remove from the end of the List if possible.
Refactoring of known solution FitnessEvaluators.  Increased thread
timeout.  Unit test DRY refactoring.  Removed obsolete unit tests.
Stopped unit tests from printing stack traces when testing Exception
scenarios.