old_contents: from __future__ import absolute_import
  from .manager.tools import debug
  from .manager.man_continuous import H5Manager
  from .options import options
  
new_contents: from __future__ import absolute_import
  from .manager.tools import debug
  from .manager.man_continuous import H5Manager
  from .options import options
  from .convert.convert_tools import make_blocks
  
subject: Add __init__.py