BUG: update the CLIs to create new Markup fiduicals from point node selector

The command line module GUI helper hadn't been updated to create Markups
Fiducial nodes by default when creating new nodes was enabled. It was still
set up to create Slicer3 vtkMRMLFiducialListNodes. 
Now by default a vtkMRMLMarkupsFiducialNode will be created when Create New is
selected.
Update the Markups module logic to detect node added events and add a display
node if not in batch processing, import or restore modes.
Updated the simple region growing segmentation help documentation to refer to the
Markups module.

Issue #3417



git-svn-id: http://svn.slicer.org/Slicer4/trunk@22482 3bd1e089-480b-0410-8dfb-8563597acbee