GeocoderPlugin: added interface to Geo::Coder::Cloudmade

This one seems to get the same results like the
Geo::Cloudmade module, with the same set of problems.
.check_ortsschilder_dist target fixes

* This might be a perl bug: if "-Mopen=:locale" happens before other
  -M... switches, then the Perl modules will be loaded in the locale
  set by -Mopen (thus the current locale), which may result in Unicode
  warnings (e.g. I am using iso-8859-1 umlauts in Strassen/Util.pm and
  elsewhere). Workaround: use -Mopen as last option

* More verbosity about the output list. I was not aware that the first
  column is the distance. Now it's clear, by adding the unit "km".
data update (correction of ortsschilder)

Found some problems after running "make .check_ortsschilder_dist".
data update