Six files in the VTK source required vtk_reindent_code.py to be called
twice in order for the indentation to be corrected (all other files only
required it to be called once).  The problem with those six files was
nested blocks where all source lines between the beginning of the outer
block and the beginning of the inner block were comments.  There is
probably a way to fix the script so that it properly deals with this
situation, but simply re-processing the file until no futher changes
occur is a robust solution that gives the correct result.