Pyutils : Add recursive directory block-based copy method with progress

[davidfischer-ch]

Linked to issue #25.

And call it from Transform.py and Publisher.py to avoid duplication of code and improve readability.

Tasks

• [x] Copy and update recursive directory block-based copy of a path.
• [NO] Add doc-test to make it as reliable as possible (enhancement).
• [x] Update Transform.py
• [x] Update Publisher.py