Aleph-alpha-client

Python support

- Minimal supported Python version is now 3.7
- Previously we only supported version 3.8

New feature

- Internal clients can now select a checkpoints directly and don't have to select a model that processes their requests
- Replaced fields `normalize`, `square_outputs` and `prompt_explain_indices` with `directional` in hidden explain endpoint

New feature

- Summarization of Documents

Documentation

- Update documentation for `hosting` parameter

Bugfix

- Remove `message` field from CompletionResult

Bugfix

- Document `hosting` parameter.
- The hosting parameter determines in which datacenters the request may be processed.
- Currently, we only support setting it to "aleph-alpha", which allows us to only process the request in our own datacenters.
- Not setting this value, or setting it to null, allows us to process the request in both our own as well as external datacenters.