Refactor compare

[mastoffel]

• polished get_model to retrieve any model, not just the best
• create mean scores function for summarise scores_df
• add tests resolves #102

[github-actions[bot]]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
autoemulate
compare.py					289
metrics.py
printing.py
utils.py
tests
test_compare.py
test_cross_validate.py
test_printing.py
test_utils.py
Project Total

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