Fixes: The comparative views are not updated when time is changed

The comparative views were updated only when another 3D View existed.

Change-Id: I1199d38bace93c189fc53c00910822e7bb49ef5d
Fix typo in error message.

Change-Id: I57db7bed7a0a1dc6802481d60a7643703271f8bd
Add vtkEnsembleReader for reading an ensemble of simulations.

Change-Id: I7d1cdcefd08b70e1810c05113d4fa6e0841a6b3e
Refactor vtkFileSeriesReader to use vtkMetaReader.

Change-Id: I12ebf1c085a44d61681909109680cdf63c1ab373
Add test for vtkEnsembleReader

Change-Id: I6f3662e66af18f33505df87fff7848f54ee06296
Rename vtkSIFileSeriesReaderProxy to vtkSIMetaReaderProxy.

vtkSIMetaReaderProxy is used for both vtkFileSeriesReader and vtkEnsembleReader
which have a common base class vtkMetaReader.

Change-Id: If89b92f08e37d4ba4ae46e447f433a9d9b6627eb
Change the link to VTK.

Change-Id: I11a934c4b5d9fe8b1098a5eba76f70b792e6539b
Merge topic 'ensemble-reader' into next

ba84bd57 Change the link to VTK.
321f226c Rename vtkSIFileSeriesReaderProxy to vtkSIMetaReaderProxy.
bf3cd41a Add test for vtkEnsembleReader
903bd3c3 Refactor vtkFileSeriesReader to use vtkMetaReader.
c44a6223 Add vtkEnsembleReader for reading an ensemble of simulations.
74c8d142 Fix typo in error message.
882423dd Fixes: The comparative views are not updated when time is changed