[Oberon] Improved version of module ORB for Project Oberon 2013

[Andreas Pirklbauer]

I have been asked to make the way Extended Oberon implements import/export available to Project Oberon 2013 as well.

There it is: http://github.com/andreaspirklbauer/Oberon-module-imports <http://github.com/andreaspirklbauer/Oberon-module-imports>

The most important change is that the “fixup" technique for types has been eliminated altogether (as it is not needed, given that pre-order traversal is used to export types).

Also, ORB.ThisModule has improved heuristics for what combinations of explicit imports (via declaration) and re-imports are allowed.
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