I enhanced the "XRay Image" query to support outputting the bounds 
of the ray bundle to a VTK file to aid in verification of the setup 
of the rays. The rays will be output to the file "ray_bounds.vtk". 
The setup can be verified by adding a Mesh plot of "mesh" from the 
file "ray_bounds.vtk" to the object to be ray traced. Outputting the 
bounds of the ray bundle is controlled with the "output_ray_bounds"
setting to the query from the command line interface and with the 
"Output ray bounds" setting in the graphical user interface. This 
resolves #2290.



git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@26621 18c085ea-50e0-402c-830e-de6fd14e8384