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The error returned by `server.GetBlobsPath` in `showLayer` was never
checked. Check the error and return if not nil. Also, make newlines at
the end of error messages consistent and fix a typo.

Co-Authored-By: Jeffrey Morgan <jmorganca@gmail.com>

- defer closing llm on embedding
- do not override licenses
- remove debugging print line
- reformat model file docs

Fixes #282

- default to embeddings enabled
- move embedding logic for loaded model to request
- allow embedding full directory
- close llm on reload

automatically set num_keep if num_keep < 0