[Oberon] Import hierarchies of display modules.

[Alexander Ilin]

Hello!

> did you ever play with dotty? http://www.graphviz.org

  Since we are talking GraphViz, let me share my sample here:
  http://oberoncore.ru/library/iljin_blackbox_sysgraph

  The image on that page was generated automatically by parsing IMPORT sections of source files, and then feeding the result to dot.exe (part of GraphViz package). The tool to do it (ImportGraph) was released with source for free here:
  http://forum.oberoncore.ru/viewtopic.php?p=46375#p46375

  It's made in XDS Oberon-2, but it is small and easily portable.

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Александр