Fix typo Sceenshots -> Screenshots

Change-Id: Icf250eb057a181e92aa863c90a67e7f824f49531
vtkPVRenderView::UseInteractiveRenderingForSceenshots is renamed to
vtkPVRenderView::UseInteractiveRenderingForScreenshots
Query the 'name' attribute if 'function' is not defined for a Property.

When defining a pqPropertyWidget subclass for a PropertyGroup,
the 'function' attribute of the Property element is used to
specify the functionality queried by the
custom widget. This allows to use the same custom widget for different
property groups. However this also forces one to define the 'function' attribute even if the custom widget is only applied to one property group. For those cases, we use the 'name' attribute if 'function' is not defined.

Change-Id: I57b75c4fcfe3201eb615f29e258303f7a7937335
Move options for RenderView into the PropertiesPanel.

Aditional view changes: MultiSlice, QuadView, MantaView, PrismPlugin
Fixed tests that accessed ActiveRenderViewOptions.

Change-Id: Ie6f29eb338a7e462b27890d88dd2b874d144925b
Fixed issues with undoing view deletion.

The problem was stemming from the fact that properties on subproxies were being
modified when the parent proxy was reading XML and setting iVar on subproxy
properties such as PanelVisibility. Fixed by telling the subproxy to ignore all
property changes while the XML is being processed.

Change-Id: I42981266f5ff53eee80c09f39ea490857bc6ece1
Rename SMPythonTesting to smtesting

See commit bf42bb840bd2f9147859c292f9fa2f5d2f6c3b51.
Not sure why this test did not fail earlier.

Change-Id: I02234784119bccf77cf1c8b5077e67b17311a42f
Remove testing of 'Camera Parallel Projection' from pv.UndoRedo6

Because of moving of RenderView settings into the Properties Panel, 'Camera
Parallel Projection' is not saved into the undo stack (bug 14534).
A new test for this will be added when the bug will be fixed.
We updated the test image so that it reflects a perspective projection.

Change-Id: Id834ee52603088a35517f5448efc5645cd5305e7
Merge topic 'view-settings' into next

8664ab6f Remove testing of 'Camera Parallel Projection' from pv.UndoRedo6
3dbcdaf2 Rename SMPythonTesting to smtesting
d17b34c0 Fixed issues with undoing view deletion.
139c216a Move options for RenderView into the PropertiesPanel.
0e8c8a7d Query the 'name' attribute if 'function' is not defined for a Property.
2f9285ba Fix typo Sceenshots -> Screenshots