RAII for auto-closing file streams

Small fixes I didn't want to include in unrelated PRs.

There are a few left in `storage.cpp` but since it's a single function
in 600 lines of code, I didn't want to touch the mess. The others are
safe to remove, cucumber and test run on Finland gives 👍.

src/extractor/compressed_edge_container.cpp

@@ -84,8 +84,6 @@ void CompressedEdgeContainer::SerializeInternalVector(const std::string &path) c
         }
     }
     BOOST_ASSERT(control_sum == prefix_sum_of_list_indices);
-    // all done, let's close the resource
-    geometry_out_stream.close();
 }
 
 // Adds info for a compressed edge to the container.   edge_id_2