BUG: Ensure slice intersection position are updated using VTK6. Fixes #3803

This commit fixes a regression introduced when transitioning to VTK6.

Note that ideally a pipeline should be created, that would avoid to
manually call Update or Modified.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23568 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: fix case of Qt method in VTK branch

Qt methods start with lower case and probably this
branch never got tested on VTK5.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23569 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Script exited with error when writting out intermediate results with tasks that included subparcellation

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23570 3bd1e089-480b-0410-8dfb-8563597acbee