ed: extrapolation of house numbers in geopal

fix http://jira.canaltp.fr/browse/NAVITIAII-1406
ed: s/traduction/translations
ed: add comments and change to clearer function names
ed: remove a useless typedef in geopal_parser
Merge pull request #796 from TeXitoi/geopal-house-number

ed: extrapolation of house numbers in geopal