This means that CoordSystem, DensityType, Map::Marker, Map::Ditag, Map::Qtl,
MiscSet, OntologyTerm and SeqRegionSynonym have now a fast constructor available.

Accordingly, new_fast is removed from Analysis, Feature, DataFile, DBEntry, RepeatConsensus,
Translation and UnmappedObject together with the import of weaken and isweak from
Scalar::Util.