Exposed `FormattedEntry` as an API

It is sometimes very useful to format each individual entry and list them in the way that the user want to list. For example, in a publication list, it's probably a good idea to insert a "year" title separating the publications between each year. By exposing FormattedEntry as an API, it's more flexible. I'm not sure whether you've already seen it as exposed; maybe it's just not documented :)