Include default display-format better suited to wider range of data

[bdarcus]

I work closer to the humanities and use biblatex for the data format, and work with a sources that sometimes don't have authors or title, or which use alternate fields for year like date.

The result is I have lines in my display that are mostly empty.

Though we have to check whether anything's changed in bibtex-completion since I submitted it, see tmalsburg/helm-bibtex#192, including proposed solution.

Maybe we should include that so display works better out-of-box out-of-box?

Or maybe better, move example configurations to the wiki?