Fix moving files from tmp dir to final location

Scenario for ingestion - just because I am most familiar with it:

```
/factset/0001
/errors/0001
/tmp-out
  /factset
    /namespace1/y/m/d
      /part-x
      /part-y
    /namespace2/y/m/d
      /part-x
      /part-y
  /errors
    /part-x
    /part-y
```
wip... comment