[Oberon] OP2 Vs Wirth's compiler.

[Josef Templ]

Besides the abstract syntax tree construction, one difference between OP2
and the original NW Oberon
compiler is the compatibility checking across module boundaries.
In OP2 there is a separate key (fingerprint) per exported object while in
the original compiler there is a single key
per module. Thus, whenever anything in a module is changed all clients are
invalidated. In OP2 only clients that
are using the changed object are invalidated. I don't know how this is
handled in the latest RISC5 compiler.

- JT
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