store: split the wrapping of encodedstore between _wrap and datafiles...
store: split the wrapping of encodedstore between _wrap and datafiles
The `datafiles` method of `basicstore` is doing a lot of work that should be
done on decoded filename. So we now wrap `_walk` to do the decoding, and less
work in `datafiles`.
This is necessary to make sure file from the same revlog can be grouped
together.