There is a functionaluty in ImageSegment to discover used and unused
classes. That has nothing to do and should be in ImageSegment. Stuff to be

cleaned:

ImageSegment >> activeClasses
ImageSegment >> discoverActiveClasses
ImageSegment >> swapOutInactiveClasses
ImageSegment >> activeClassesByCategory

Behavior >> induceMDFault

Behavior >> recoverFromMDFaultWithTrace
Behavior >> recoverFromMDFault