The recommended way to retrieve the logic associated with a module is:

  slicer.modules.MODULENAME.logic()

Note that all vtk classes provided by a given module logic are
directly available in 'slicer' namespace.

For example, the following object could be directly instantiated:
  slicer.vtkSlicerVolumesLogic
  slicer.vtkMRMLFetchMINode
  slicer.vtkMRMLFetchMINode
  slicer.vtkSlicerEMSegmentLogic

Note also that libraries specific to a module, for example
 Modules/EMSegment/MRML, are not yet wrapped or exposed to python.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@15737 3bd1e089-480b-0410-8dfb-8563597acbee