CMFActivity: use relative import for CMFActivityParallelBackend

product/CMFActivity/__init__.py

@@ -41,7 +41,7 @@ document_classes = updateGlobals(this_module, globals(),
 def initialize( context ):
   # Define object classes and tools
   import ActivityTool, ActiveProcess, ActivityConnection
-  from joblib import CMFActivityParallelBackend
+  from .joblib import CMFActivityParallelBackend
   object_classes = (ActiveProcess.ActiveProcess,
                     #ActivityConnection.ActivityConnection
                     )