- change and rename cmd instvar ::xotcl::instvar -object someObject newVar into ::xotcl::importvar someObject newVar Rationale of change: only needed in xotcl2 for importing variables from different objects
- added existence test for slot extractor (needed for 8.5.8) - added refcounting CallStackDoDestroy() to ensure existance of object until end of function - make sure to call PrimitiveDestroy() before DeleteCommandFromToken(), otherwise e.g. unset traces on this object cannot be executed - regression test works again