BUG: use vtkNew for copied look up tables

Use vtkNew to define new color look up table and
color transfer function for copying to the actor's
mapper for models.



git-svn-id: http://svn.slicer.org/Slicer4/trunk@22810 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: add a new color node, continous around 0.0

Add a method to create a new procedural color node that's useful for
visualizing error statistics centered around 0, called RedGreenBlue.
Rename AddRandomNode to AddDefaultProceduralNodes and add the RandomIntegers as
well as the new RedGreenBlue node in it. This will provide a space to add
new default procedural color nodes.
Create a new color node category, Continuous, and place the new node
in it.



git-svn-id: http://svn.slicer.org/Slicer4/trunk@22811 3bd1e089-480b-0410-8dfb-8563597acbee