Properly default direct-superclasses when initializing class metaobjects.
Properly default direct-superclasses when initializing class metaobjects.

Additionally, remove the non-MOP path from ENSURE-CLASS and just call
ENSURE-CLASS-USING-CLASS.

varjagg/Mezzano,froggey/Mezzano,rvedam/Mezzano,froggey/Mezzano,rvedam/Mezzano,varjagg/Mezzano