--progress disables the progress bar, and the RDF ignores the setting entirely

Two related bugs:

```
(no flag)     -> progress bar shown
--progress    -> progress bar HIDDEN     (help says "Show progress bar.")
```

And independently: `rdf.py` imports `with_progress_bar` by value at module import, so whatever the flag sets at runtime never reaches the two tqdm call sites — the RDF bar cannot be turned off at all.