[vtkusers] vtk on AIX 4.3

[Dick Dunbar]

Porting notes:

0) Set environment variable VTK_DATA for some of the examples

1) variable "hz" is defined by system header files.
   I fixed this "on the cheap" in contrib/vtkImageReslice.cxx
   by adding this line after the #include:
     #undef hz

2) graphics/vtkColorTransferFunction.cxx
   The word is "deprecated", not "depricated".
   Error messages are displayed running examplesTcl/cursor.tcl

3) graphics/examplesCxx/probe
   Be careful of your PATH variable here.  /usr/sbin/probe is a
   system routine.  Use:  ./probe to execute the sample.

4) graphics/examples/Cxx/stCone
   error msg: C++ Smoke test failed ... unable to open valid/Cone.cxx.ppm