Post-transform RDFS inference

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Currently Skosify only supports RDFS inference which is performed before doing 
the type and property transformations. It would be useful to allow inference to 
also be performed after transformation.

The --infer option should be split into two options: --pre-infer and 
--post-infer.

The current custom skosext inferences could perhaps be more cleanly implemented 
using RDFS post-inference.

Original issue reported on code.google.com by osma.suominen@helsinki.fi on 13 May 2011 at 12:43