Ranx

Added
- Added `dcg` and `dcg_burges` among the available metrics.

Fixed
- Fixed missing dependency `seaborn`.

Fixed
- Fixed a bug affecting the download of ranxhub runs with special symbols in their ids, such as `+`.

Changed
- Changed `save` in `ranxhub.py` to automatically save average metric scores.

Fixed
- Fixed a bug affecting `make_comparable` in `run.py`: runs were not sorted after this operation, resulting in wrong metrics computation afterwards.

Added
- It is now possible to plot Interpolated Precision-Recall Curve. Click [here](https://colab.research.google.com/github/AmenRa/ranx/blob/master/notebooks/7_plot.ipynb) for further details.

Added
- Added `make_comparable` to `run.py`. It makes a run comparable to a given qrels whether the run misses results for queries appearing in the qrels or have results for additional queries, which are removed.
- Added `make_comparable` parameter to `evaluate.py`.
- Added `make_comparable` parameter to `compare.py`.