Removed:
   swoop/trunk/src/org/mindswap/swoop/utils/owlapi/OWLDifferentiator.java
Modified:
   swoop/trunk/src/org/mindswap/swoop/SwoopModel.java
   swoop/trunk/src/org/mindswap/swoop/TermsDisplay.java
   swoop/trunk/src/org/mindswap/swoop/TreeRenderer.java
Log:
Issue355 chatting
The exception seems to be intermittent.  Next time it happens the full stack
trace should be shown.
Also, removing OWLDifferentiator, and adding some javadocs to TermsDisplay.