Progres

- Bugs in domain splitting with a blank chain ID and Mac multithreading are fixed.

- Python packaging issues are fixed.

- Structures can now be split into domains with Chainsaw before searching, with each domain searched separately. This makes Progres suitable for use with multi-domain structures.
- The whole PDB split into domains with Chainsaw is made available to search against.
- Hetero atoms are now ignored during file reading.
- Example files are added for searching and database embedding.

- The `score` mode is added to calculate the Progres score between two structures.

- Incomplete downloads are handled during setup.

- The environmental variable `PROGRES_DATA_DIR` can be used to change where the downloaded data is stored.
- A Docker file is added.
- Searching on GPU is made more memory efficient.
- Bugs when running on Windows are fixed.