Release 0.6.0 fix examples (#444)

* retro python plugins

* fix examples

* put back index

* fix gen

* fix stress distributed

Author: cbellot000

ansys/dpf/core/operators/serialization/__init__.py

@@ -14,6 +14,7 @@
 from .vtk_export import vtk_export 
 from .vtk_to_fields import vtk_to_fields 
 from .migrate_file_to_vtk import migrate_file_to_vtk 
+from .serialize_to_hdf5 import serialize_to_hdf5 
 from .workflow_import_json import workflow_import_json 
 from .workflow_export_json import workflow_export_json 
 from .vtu_export import vtu_export