[vtkusers] Include files

[Gib Bogle]

This is a question or a suggestion.  VTK include files are scattered across the 
directory tree.  Is there a simple way to gather them all together in the same 
directory?  I'm building a Qt app (with Qt Creator and MinGW on Windows), and I 
resorted to manually copying all the "missing" VTK include files to one place so 
the compiler tools could locate them.  This seems a bit clumsy.  If I'm not just 
displaying my ignorance, perhaps an include directory containing copies of all 
the include files would be a useful addition to the VTK distribution.