do not use isNaN
Use proper method to change axis labels size

Disable menu for PDF, PS or C file - not yet implemented for RCanvas

When once disabled, let show again via context menu

Instead trying to cut connection just redirect function to Browser
constroller

No need to should QuitRoot button

Detected by DeppCode

Useless, will never be true.
Error reported by DeepCode

Was corrupted by previous reorganization of mouse event handlers.
Now assign all mouse event handlers only to specific dom element

If same GlViewerThree.js should be reused for other drawing,
one should correctly remove all handlers assigned before.

Always check if such method exists for the controller

When drawing different projection via View -> Browse to menu
commands, one have to cleanup previosely shown views.

Fixing many warnings produced by three.js

*  ui5/eve7/lib/GlViewerRCore.js
   - Picking for RCore.
   - Somewhat better RCore bootstrap, need real module loader with RCore+Reve stuff.
   - Enable EXT_color_buffer_float.

* ui5/eve7/lib/RendeQuTor.js
  - Add picking render pass, should really use reduced image and
    small region around camera.
  - Depth extraction -- partial.

* ui5/eve7/lib/EveElementsRCore.js
  Picking title.

* ui5/eve7/shaders/programs.json
  Register copyDepth2RReve shaders.

* ui5/eve7/shaders/custom/copyDepth2RReve.frag
* ui5/eve7/shaders/custom/copyDepth2RReve.vert
  New files: Copy depth buffer to r32f texture.

- Use DirectionalLight, PointLight seems to have trouble, maybe with Phong?

- Use BasicMaterial, seems there is problem with Phong, especially in ortho view.