old_contents: __all__ = ['base', 'dicom2fem', 'genfem_base', 'ioutils', 'marching_cubes',
             'mesh', 'meshio', 'seg2fem', 'viewer', 'vtk2stl']
  import base, dicom2fem, genfem_base, ioutils, marching_cubes
  import mesh, meshio, seg2fem, viewer, vtk2stl
  
new_contents: __all__ = ['dicom2fem', 'genfem_base', 'marching_cubes',
             'seg2fem']
  #    , 'viewer']
  
  import dicom2fem
  import genfem_base
  import marching_cubes
  import seg2fem
  # import viewer
  
subject: update init file