Change-Id: Ifc76340e581c5cf07b6c40b7ecd77f292b96962b

Change-Id: I755286dda63769566962bf2532b84b5c36cd77ce

SetImageConnection(a) is the same as SetInputConnection(1,a)
where, a=vtkAlgorithmOutput*

vtkImageDifference changes:
Use GetInputConnection(0,0) instead of GetInput()
Use GetInputConnection(1,0) instead of GetImage()

For a filter to do GetWholeExtent,
instead of,
   extent = filter.GetOutput().GetWholeExtent()
new method is,
   extent = filter.GetExecutive().GetWholeExtent(filter.GetOutputInformation(0))

For a vtkImageData object, SetWholeExtent and SetUpdateExtent methods are not required.

Current implementation caused the rerderer_window to have inconsistent
behavior on windows. Relevant discussion :

http://www.vtk.org/pipermail/vtk-developers/2011-August/010284.html

Panos Mavrogiorgos authored Aug 15, 2011 and David Gobbi committed Aug 17, 2011

Change-Id: I9b12d7cc0b14aefef765b60f950ebb8a74b5acd7

There are several VTK methods that return new objects and expect
the caller to delete them.  This new code checks for these methods.
Unfortunately, many python scripts were already dealing with this
by calling UnRegister() after such methods.  To maintain partial
backwards compatibility, the python UnRegister() method will now
refuse to reduce the reference count to zero.

Change-Id: I44323e9feb059ac2abfc405d3afd93671cae1d48

Thanks to Hadrien Mary for the patch.

Change-Id: I3d945aa5e15045ae12d054f0475b54b828860c71

There are several VTK methods that return new objects and expect
the caller to delete them.  This new code checks for these methods.
Unfortunately, many python scripts were already dealing with this
by calling UnRegister() after such methods.  To maintain partial
backwards compatibility, the python UnRegister() method will now
refuse to reduce the reference count to zero.

Change-Id: I44323e9feb059ac2abfc405d3afd93671cae1d48

Enhanced vtkWrapPython to recognized Qt types used in VTK classes.
Use SIP to wrap Qt classes for use with PyQt.
Also added bridge code to make VTK types work in Qt classes.

Add three methods to the python vtk module to provide convenience
for creating, extracting values from, and casting values from
vtkVariant objects.

BUG: Fixing a segfault with recent versions of VTK after Feb 5, 2010.
The specific checkin that caused this is
cc83e73b.  This patch changed the way
swig mangled pointers were checked from Python and that broke the
GetDisplayId method of wxVTKRenderWindowInteractor which caused the
segfault.

Additions so that import vtk.charts works as expected, and as it does in
other VTK Python wrapped modules.

BUG: With the Cocoa vtkTkRenderWidget, if 'update' is called in response to a configure event, the window freezes.

ENH: Fix python testing to work with Python 26 where TkInter has path objects rather than just strings.

STYLE: When an image test fails, upload full size pngs to the dashboard rather than shrunken jpegs.  This allows test writers to get comparison images directly from the dashboard.  Size is no longer an issue on the dashboard since it does file comparisons and keeps only one copy around as a test fails for multiple days.