* Iterator-based access to edges
* vtkGraph subclasses from vtkDataObject instead of vtkPointSet
* vtkGraph's implementation is much more like that of the boost graph library
* Separate classes vtkDirectedGraph and vtkUndirectedGraph instead of
a Directed flag
* Mutable classes vtkMutableDirectedGraph and vtkMutableUndirectedGraph used for building graphs

ENH:Added the ability to have number of bins in any dimension to be equal to one or more; added logic and controlling data memebers to prevent the insertion of duplicate triangles

ENH: Enable the PostgreSQL test when VTK_USE_POSTGRES is on.

ENH: The GetLastError routines have been overhauled

ENH: Remove CMAKE_SKIP_RULE_DEPENDENCY. CMAKE_SKIP_RULE_DEPENDENCY was set to ON about 3 years ago. It prevents the whole VTK from rebuilding if a package (say VTK_USE_PARALLEL) is turned ON or OFF, which is something people would complain about. This, however, also prevents VTK from rebuilding if you change build flags (say, add/remove a specific debug flag, change /MD to /MT on Win32, etc), and that's bad thing. VTK is bigger, but compilers are faster, and we want to do the right thing (tm). The next step will be to optimize the include paths so that turning on and off do not trigger a full rebuild.

BUG:NV2x drivers (Nvidia Quadro4 and GeForce4) advertised for OpenGL 1.5 but they support the features of the 1.4 core promoted extension GL_EXT_blend_func_separate in software (poor performance).

BUG:NV2x drivers (Nvidia Quadro4 and GeForce4) advertised for OpenGL 1.5 but they support the features of GL_EXT_blend_func_separate is implemented in software.