yeah ;)   e.g.

```
[SLC             ] DBG:                              +0:00:01 ====_____[26%]____ -0:00:03  ROI 61 (7/27), 6 features
```
and as before jumping due to multiple pprocs... 

just thoughts out loud:   I wonder if we may be could do here smth like

```debug('SLC' if iblock in ['main', 0] else 'SLC_', ...```

thus reporting on the progress only for the main block,.... but if we split into more blocks than nproc then we would loose any progress when going into the ones > nproc -- nah, bad idea then