Rename IClonable into IClonableAdapter

entities.py

@@ -146,7 +146,7 @@
         return None
 
 
-class IClonable(EntityAdapter):
+class IClonableAdapter(EntityAdapter):
     """Adapter for entity cloning.
 
     Concrete classes should specify `rtype` (and possible `role`) class

test/data/entities.py

-from cubes.compound.entities import IClonable, IContained, IContainer, structure_def
+from cubes.compound.entities import (IClonableAdapter, IContained, IContainer,
+                                     structure_def)
 
 
 def agent_structure_def(schema):
     return structure_def(schema, 'Agent').items()
 
 
@@ -2,10 +3,10 @@
 
 
 def agent_structure_def(schema):
     return structure_def(schema, 'Agent').items()
 
 
-class AgentIClonable(IClonable):
+class AgentIClonableAdapter(IClonableAdapter):
     rtype = 'clone_of'