0025556: Visualization - support stereo pair formats recognized by consumer display devices

Graphic3d_StereoMode - add new enumeration for stereoscopic outputs:
- Graphic3d_StereoMode_QuadBuffer
- Graphic3d_StereoMode_Anaglyph
- Graphic3d_StereoMode_RowInterlaced
- Graphic3d_StereoMode_ColumnInterlaced
- Graphic3d_StereoMode_ChessBoard
- Graphic3d_StereoMode_SideBySide
- Graphic3d_StereoMode_OverUnder

Graphic3d_RenderingParams - add new options controlling stereo output:
- StereoMode
- ToReverseStereo
- AnaglyphFilter

OpenGl_ShaderManager - add predefined GLSL programs for new stereo outputs.
OpenGl_Workspace::Redraw() - do not implicitly disable stereo to allow stereo dump as is.
OpenGl_Caps - add flag swapInterval to control VSync.
OpenGl_Workspace::BufferDump() - handle cases with non-applicable GL_PACK_ROW_LENGTH.

CALL_DEF_WINDOW - drop unused fields; add fields "left" and "top"
to reverse stereo pair for interlaced output depending on window position.

Draw Harness, ViewerTest:
- Extend syntax of command vstereo to setup stereo.
- Extend vdump command to allow dump of stereoscopic pair in different formats.
- Extend command vcaps with option vsync.
- Use mouse scroll to zoom and adjust ZFocus in WinAPI.
- Use "/" and "*" to adjust IOD.

v3d/glsl/stereo - add test case for stereo modes.

Cocoa_LocalPool, OSD_EnvironmentIterator - fix compilation issues on OS X Snow Leopard.

src/OpenGl/OpenGl_Context.hxx

@@ -299,6 +299,9 @@ public:
         || (myGlVerMajor == theVerMajor && myGlVerMinor >= theVerMinor);
   }
 
+  //! Access entire map of loaded OpenGL functions.
+  const OpenGl_GlFunctions* Functions() const { return myFuncs.operator->(); }
+
   //! Clean up errors stack for this GL context (glGetError() in loop).
   Standard_EXPORT void ResetErrors();
 
@@ -314,6 +317,9 @@ public:
   //! Swap front/back buffers for this GL context (should be activated before!).
   Standard_EXPORT void SwapBuffers();
 
+  //! Setup swap interval (VSync).
+  Standard_EXPORT Standard_Boolean SetSwapInterval (const Standard_Integer theInterval);
+
   //! Return true if active mode is GL_RENDER (cached state)
   Standard_Boolean IsRender() const
   {