Fix bug in picking of invisible props in an assembly.

This bug was described in
http://paraview.org/Bug/print_bug_page.php?bug_id=9459
When a actor in an assembly is hidden it may happen that it can
be picked anyway. To fix that we make sure the prop is
visible and pickable before performing the pick rendering pass for it.

Change-Id: I0c546d68ffe41cce956f7a59e8c8b4defeddb0c0
Merge topic 'remove_invalid_checks' into pv-master

c19112e5 Remove OpenGL error checks that were causing errors.
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: Ie19e8db2d9377fa797cdfa277e1ba460b3b4d1d7
Merge topic 'FixAssemblyHiddenPropPicking' into master

ba7959d8 Fix bug in picking of invisible props in an assembly.
Allow custom Interaction/Widgets test timeouts

Create VTK_TEST_TIMEOUT_<test> settings that can be configured
locally to increase the default timeout for tests:

  TerrainPolylineEditor
  TestPickingManagerSeedWidget

Use the existing test timeouts as the default values.

Change-Id: I827078610fff305d24f690f7a278a6503ef32daa
testing: add some missing TEST_DEPENDS

Change-Id: Idf4f870e2046dafe3c5bf8aa2ca9c5f2f6d79a37
Merge topic 'custom-interaction-test-timeouts' into master

622d753a Allow custom Interaction/Widgets test timeouts
Merge topic 'missing-test-depends' into master

64a98b47 testing: add some missing TEST_DEPENDS