[Oberon] SYSTEM Modules

[Diego Sardina]

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> Consequently I’m thinking of implementing an extension to the Astrobe Oberon-07 compilers. This will allow low-level modules to be specified by prefixing the keyword MODULE with the keyword SYSTEM (similarly to the DEFINITION and IMPLEMENTATION module prefixes in Modula-2). Such system modules would allow / require any SYSTEM objects to be referenced unqualified.

It's more similar to what Modula-3 adopted for this. Modules that are going to use unsafe procedures/functions must place UNSAFE before the keyword MODULE or INTERFACE.

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> Any comments?
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In my opinion it's a good solution.