Backwards-compatibility re-export hub for the split DataFrame.Typed.TH.* modules:

• DataFrame.Typed.TH.Records — record-based schema derivation (no file IO)
• DataFrame.Typed.TH.CSV — CSV-file-based schema derivation (requires -fwith-csv)

These live in dataframe-th and dataframe-csv-th respectively. The CSV re-export is guarded with the CSV_TH CPP define that the meta-dataframe package sets based on its cabal flags.