Full word terms are already preferred for the name part. Adding
only one-word partials to the address, makes it impossible to
give a similar preference for the address part. Each term adds
a rank penalty. The problem here is that we interpret the query
forwards and backwards. Having different penalty systems for
name and address means that the same term ends up with different
penalties and that often leads to interpretations of the wrong
direction being in the way.
Results where the housenumber was dropped are an unlikely result
when they refer to something other than a street. Therefore
increase their result rank so that other matches are tried first
before choosing them as a result.
Improves #2167.