Usage:
  selected_raws.php?area=nameids=id_list&cats=cat_list&day=day_to_get&month_to_get&year=year_to_get=
    where:   
                area = name asigned to group of RAWS stations
             id_list = a comma-separated list of RAWS stations by WIMS id and 
           cats_list = a comma-separated list of WIMS climate/fuel identifiers corresponding to the id_list stations

    the following are optional parameters can be omited if you only want the latest data:
          day_to_get = day to retreive
        month_to_get = month to retreive
         year_to_get = year to retreive