ENH: Added compile-time options VTK_LEGACY_REMOVE and VTK_LEGACY_SILENT along with VTK_LEGACY macro.  This provides a new deprecation mechanism with more user control over whether deprecated code is available and whether using it produces warnings.  Wrappers now also take the deprecation mechanism into account.

BUG: When ReportReferences method is defined we need to enable garbage collection by overriding Register/UnRegister.  Most classes inherit enabled GC, but this one does not.

BUG:  Fix vtkCarbonRenderWindow::SetSize on MacOSX so the scene is drawn correctly
      when SetSize is called and there is no parent.

      Fixes bug #1286.

      Also remove AppleGL and GL calls in vtkCarbonRenderWindowInteractor that aren't needed
      anymore as a result of this fix.

The cvs command to commit this change is:
  cvs commit -F commit.msg vtkCarbonRenderWindow.cxx vtkCarbonRenderWindowInteractor.cxx

BUG: Renamed ExitAbort to ExitError in vtkDebugLeaks.  It now calls exit(1) instead of abort().  This avoids the popup dialog on Windows.

ENH: (1) converting to use the new pipeline; (2) checking whether an input exists before asking for its number of points or cells