ConceptMap for migrating from one version to another

[jpwiedekopf]

The information obtained by computing the difference graph, as well as the vicinity graph, can be used as the basis for a semi-automatic ConceptMap generation, so that data coded with one version can be migrated to the newer version.

This feature was suggested by @hannesUlrich

[jpwiedekopf]

Feedback from Cora has made me question the current implementation of ConceptMap. The use case for mapping in case of additions is extremely slim at best, and poses significant challenges for generating the auto-mapped concepts. Automapping should only be supported for deletions, while UI for adding arbitrary mappings should be mapped.