OA: Cluster type ClusterBody as boundary provider

[detlefarend]

Description/Motivation
Is a body-based Cluster in MLPro automatically a boundary provider?

Task list

• 1. Do this
• 2. Do that

Cross references
mlpro.bf.math.statistics.BoundaryProvider
mlpro.oa.streams.clusteranalyzers.clusters.ClusterBody
mlpro.oa.streams.clusteranalyzers.clusters.properties.Body