>=1
--
	* skipping of normal, non-unified files
	* general progress-messages

>=2
---
	* deunify/unify messages
        * skip-reason
	* more detailed progress-messages

>=3
--
	* skipping of already unified files

>=4
--
	* source of unification; when verbosity==4 -> vserver-id, else
	  physical path

>=6
---
	* skipping of dirs and dotfiles
