Removes admin level 7, which should not exist and promotes
admin level 8 to municipality level.
place=municipality is only used for boroughs of St. Petersburg,
so demote to level 18.
Fixes#926.
Boundaries and places now always get a rank < 26 to make sure that
they do not parent to a street. Skip boundary=place completely
because they will be covered throught the secondary place tag.
Squares are now addressable (on address level 25) and thus can
be attached to a house number via addr:place. Needed to increase
the rank range for matching up addr:place to 25.
So far we've used a buffer around a place node to define its
potential address reach. This had two problems: the buffer was
so large that addresses often contain false positives and the
buffer is really distorted when getting closer to the poles.
Change the buffer here to draw a bounndig box at a certain
distance in meter. This means that we always use the same
box everywhere on the planet and can make the extent much
smaller. Using a box has the advantage that it is much faster
to figure out if a point is within the box.
A lot of streams in OSM are of minor importance, they certainly
should show up lower in the list of results than villages. Those
rivers/streams that are well known have a wikipedia page and get
a higher importance from that.
The disadvantage with downgrading is that the address gets even
more useless but that's something that needs to be solved outside
the rank search.
Gets rid of the hard-coded expection for place nodes and sets
the address rank generally via the address level config instead.
That means only administrative boundaries are now used at that
level in addresses.
