Adds a general higher penalty for special search term and an
additional one if the term is anywhere but the beginning or the
end. Also housenumbers and special searches together are less
likely.
When we are in the final iteration of the search groups, it is not
possible to further delay the results. Unconditionally use the
results with the best rank instead.
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.
Also switches to jinja-based preprocessing, which allows to
simplify the SQL files. Use 'if not exists' where possible
so that the step can be rerun to fix missing indexes.
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.
So far the data directory constant has pointed to the source
directory to be usable with different subdirectories. Now only
the data subdirectory itself is being used with the constant,
so point to the directory directly.
This replaces {data_dir}/settings throughout the code, so that
the configuration may be placed somewhere else in the directory
structure (e.g. in /etc).
