handle label hierarchies in apoc.meta.graph and others

[neo-technology-build-agent]

Issue by jexp Monday Feb 04, 2019 at 11:45 GMT Originally opened as https://github.com/neo4j-contrib/neo4j-apoc-procedures/issues/1074

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• infer label hierarchy from co-occurence (which one is part of another see @jbarrasa)
• escalate relationship to the highest common level that they appear on