Added code to draw current selection rectangle in viewport.

When the viewport is in selection mode, there is now some visual
feedback indicating what the selection will contain.

Change-Id: I118c47250dd3e56047227b1a4a483de0d30d96b0
Merge topic 'vtkweb-add-selection-rectangle-to-viewport-rel' into master

c2af9cb1 Added code to draw current selection rectangle in viewport.
Merge branch 'vtkweb-add-selection-rectangle-to-viewport-rel' into release

Change-Id: I8ab5c3a36f2e1649cee91552b1a5c3f1be277dec
Merge branch 'release'

Change-Id: I4578524d30aa205bf677bebbcfa5582f73dbce63
Merge topic 'update_vtk' into pv-master

4fafafc Merge branch 'vtkweb-add-selection-rectangle-to-viewport-rel' into release
c2af9cb Added code to draw current selection rectangle in viewport.
0aac1cb Merge branches 'cocoa-configure-event-rel', 'catalyst-web-rel' and 'pvweb-add-filebrowser-cache-option-rel' into release
59ae032 Added code to support a cache option for filebrowser widget.
1a8d823 Add catalyst web widget into VTK
e874606 Merge branch 'release-add-SourceTarball-script-rel' into release
0bf3a66 Merge branch 'vtkweb-update-vgl-rendering-rel' into release
947ca93 Merge branch 'pvweb-fix-selection-rel' into release
7b81e67 Merge branch 'fix_test_set_get-rel' into release
7ae311e Merge branch 'fix_particle_tracking' into release
4021de7 Merge branch 'gcc-4.8.3-compile-error-rel' into release
0d49103 surface LIC - stl and NULL
0d24c40 Merge branch 'clang_libc++11_support-rel' into release
0d96cb9 Merge branch '14503_fix_intel_build-rel' into release
0fb3dd7 BUG: Fix build failure in RenderingParallelLIC on Intel compiler
7134a7d Merge branch 'fix-append-filter-for-polyhedron-cells-rel' into release
...
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: I370b147e8ffdd5b1ce8f6b15443fb751a86376aa