BUG #14280: Fixed issues with multiple views in  batch.

Renderings with multiple views were ending up being mangled since the renderers
were not getting disabled in the shared render window especially for chart
views. This addresses that issue (added a test using the script provided by the
bug report).

Also fixed the warning message about StereoCapableRenderWindow that would pop up
every time a new view was created in any mode where a shared render window was
being used.

Change-Id: I43a578c7978b45f452e6b6fd845aac764e0ef235
Merge topic '14280_fix_multiview_rendering_in_batch' into next

64a18e6 BUG #14280: Fixed issues with multiple views in  batch.
Add mechanism to use offscreen for context views.

Added mechanism to use offscreen rendering for context views. This also add
support to capture images without offscreen for context views. Thus context
views now behave similar to render views for capturing screenshots and offscreen
rendering.

Change-Id: I5b42f504cd7a2bec14406bec36b52bd5d468f215
Merge topic '14280_fix_multiview_rendering_in_batch' into next

a9a3b90 Add mechanism to use offscreen for context views.