BUG #14003: All views were not updated after apply.

When the pqPropertiesPanel was "Apply"-ied, it didn't update all the view for
the change proxies. Hence only the active view was updated. That's a bug. Fixed
that.

Change-Id: I06f36b7d143f019a91fc1adc0b744a3d7c5d236d
Merge topic '14003_fix_view_updates' into next

6358fd2 BUG #14003: All views were not updated after apply.
Added vtkFiltersCore to paraview/vtk/__init__.py.

The goal is to enable some of the core filters in ParaView's
vtk module such that they can be easily access from the
Python programmable filter.

Change-Id: Iabfb360b96ae263e0fc042adf7a30bef6271568f
Merge topic '14006-add-filters-to-paraview-vtk-python' into next

21d0ec2 Added vtkFiltersCore to paraview/vtk/__init__.py.