Anonymisation in converter, parser consistency

Now we can anonymize data. Use the --anonymize option. This includes
person data as well as location info (lat/lon truncated to two decimal
digits).
Parser is now more fault tolerant when trying to consolidate several
devices into one. Since we have two sources of information for
consolidating this infos (the OLSR MID table and the information from
the spider) these can have slightly differing information.