small
Split the IOTW code into several modules.

There seem to be two approaches:
(1) the resource pairs for all predicate sets that occur in the alignments, and
(2) the resource pairs for all predicate sets that occur in the RDF graph.

The latter approach is also able to find extensions of the identity relation
(besides just assessing the quality of the existing identity relation).

Some of the processing seems to be in the export code, extract this in the future.
The codebase still needs to be further documented and cleaned.

Merge branch 'master' of https://github.com/wouterbeek/IOTW

Conflicts:
	iotw.pl