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- re-use previously evaluated embeddings when possible
- change embeddings digest identifier to be based on model name and embedded file path

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

Fixes #297
Fixes #296

num_keep defines how many tokens to keep in the context when truncating
inputs. if left to its default value of -1, the server will calculate
num_keep to be the left of the system instructions

* resolves: https://github.com/jmorganca/ollama/issues/300 and
https://github.com/jmorganca/ollama/issues/282

* example usage:
```
ollama serve --port 9999 --allowed-origins "http://foo.example.com,http://192.0.0.1"
```