Prefix longest match

[BenjaminHofstetter]

In a SPARQL select result the notebook uses prefixes to show a shorter more readable output. But it's using the first match and not the longest match.

PREFIX foo: <http://example.org/foo/>
PREFIX bar: <http://example.org/foo/bar/>

<http://example.org/foo/bar/Person>
# Leads to ...
foo:bar/Person

[BenjaminHofstetter]

moved to issue #51