Adding test which goes through all the filters in the GUI
code clean up

removed commented out code, tweak a comment, and a print statement
Corrected execution and slicer update

moved filter execution into Logic class. Switch from
sitkUtils.PushToSlicer, to more custom methods to manual set
background image. This approach does not create a new node.
Tweaking a couple JSON fields to load as number into python
reduce delay of message during test
Only add SimpleITK filter if the name exists in SimpleITK namespace.

This should enhance compatibility.
restrict fiducial nodes to not include the top level
Add tooltip for filter ComboBox with basic description