Numerapi

- cli: support uploading predictions generated with the new dataset (needs `--new_data`)
- signals: make `round_model_performances` available

- signals: support upload to diagnostic tool
- cli: added `list-datasets`
- cli: implement downloading of the new dataset
- some code cleanup

- add query `round_model_performances` (60)
- fix documentation
- upgrade from `latestSubmission` to `latestSubmissionV2`
- Indicate source `numerapi` when uploading submissions
- Deprecate `get_account_transactions` - data no longer available
- Deprecate `get_transactions` - data no longer available
- Add `wallet_transactions`, fetches all transactions to / from your wallet
- Code style improvements

- support passing `round_num` to `list_datasets`, to get available files from past rounds
- `download_dataset` no longer requires a destination path, it defaults to the source file name
- `download_dataset` now accepts a `round_num` argument, to download old files
- added `upload_diagnostics` to upload to the new diagnostics tool
- added `diagnostics` to fetch results of a diagnostics run

- Add version arg to upload_predictions (59)

- added `list_datasets` to fetch the list of available data files
- added `download_dataset` to download files from the new data api
- add missing documentation and deprecation warnings