Refactor: Delete obsolete function

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/database/DatabaseHandler.java

@@ -226,22 +226,6 @@ public class DatabaseHandler {
         return cos;
     }
 
-    public List<GmlId> getAllGmlIds() {
-        List<GmlId> cos = new ArrayList<>();
-        try (Connection con = new ConnectionWrapper(H2GISDBFactory.openSpatialDataBase(DB_NAME))) {
-            try (PreparedStatement ps = con.prepareStatement("SELECT gmlid FROM features")) {
-                ResultSet rs = ps.executeQuery();
-                while (rs.next()) {
-                    cos.add(new GmlId(rs.getString("gmlid")));
-                }
-            }
-        } catch (SQLException e) {
-            //TODO: Localize String
-            logger.error("Connection to database failed while trying to get all CityObjects!");
-            logger.debug(e.getMessage());
-        }
-        return cos;
-    }
 
     public List<GmlId> getBufferIntersectingObjects(CityObject co, double bufferSize) {
         return getBufferIntersectingObjects(co.getGmlId(), bufferSize);