DLM logging enhancements for the Favorites feature branch

Adds massively more `TRACE` and `DEBUG` level logging in DLM in support for the Favorites feature branch.  This is useful in troubleshooting Favorites because Favorites is storing the set of individually favorited portlets and the set of favorite collections of portlets as portlets in a fragment of type "favorite" and as folders of type "favorite_collection", respectively, and so is very reliant on DLM support for user edits to, user deletes of, their experience of DLM managed fragments.