Changes

Summary

1. add test and fix that allows removal of propertyslots when instances are (details)

Commit 585afa145783686b782fa8217d42e75392e192f9 by marcus.denker add test and fix that allows removal of propertyslots when instances are present.
	src/Shift-ClassInstaller/ShiftClassInstaller.class.st (diff)
	src/Slot-Tests/PropertySlotTest.class.st (diff)