Remove VTK_USE_DISPLAY from CMakeLists, cxx and h.in files.

This variable is not set anywhere, only tested. Additional tests
are included because of this change : tcl:squadViewer,
cxx:RenderNonFinite, SurfacePlusEdges, TestLabelPlacementMapper

Change-Id: I1ffa1462d6fb4aed3fb0ee60ec94ffae93b48fe0
Compute opacity corectly for vectors.

Compute either vector magnitude or select the correct component. Use data
pointers instead of general api for accessing tuples.

Change-Id: Ie7bfbb276aacb7c652b61ffe64111bc7f4181ed4
Test for generating opacity from vectors (multi-component scalars).

We either select one component or compute the vector magnitude.
We test vtkMapper::InterpolateScalarsBeforeMapping on or off.

Change-Id: I9ed01063c6858dca99297311c509e1fea0f2099d
add a / at the end of the session manager url

Change-Id: Ifbf096da6c6f7cb0b3eef2e1c6c00ed94ce5b3ab
Merge topic 'pvweb-session-manager-url-update' into master

4e7d5bc5 add a / at the end of the session manager url
Merge topic '14350-opacity-interpolate-scalars' into master

92f48c6f Test for generating opacity from vectors (multi-component scalars).
caf6bf1d Compute opacity corectly for vectors.
358a5887 Remove VTK_USE_DISPLAY from CMakeLists, cxx and h.in files.
update JS doc comments

Change-Id: Iedfb9b3ace90e84f7d6e15d8e017bfcbadde39a7
Merge topic 'pvweb-doc-update' into master

eec72703 update JS doc comments