Document, test and fix SmartTagger:
I think the comparison in reset() is the wrong way around: https://gitlab.vci.rwth-aachen.de:9000/OpenVolumeMesh/OpenVolumeMesh/-/blob/52042166262c32729498a671b1b92ffe1c7eb299/src/OpenVolumeMesh/Util/SmartTagger.hh#L23-28