Merge topic 'ioss-writer-write-vector-arrays'

2a54d36a vtkIOSSModel: Write 2d/3d arrays as a vector instead of separately

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Yohann Bearzi (Kitware) <yohann.bearzi@kitware.com>
Merge-request: !10494