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If the chunk download is interrupted, resume from where we left off

* add `"format": "json"` as an API parameter
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Co-authored-by: Bruce MacDonald <brucewmacdonald@gmail.com>

- add the optional `raw` generate request parameter to bypass prompt formatting and response context
-add raw request to docs

* allow for a configurable ollama models directory

- set OLLAMA_MODELS in the environment that ollama is running in to change where model files are stored
- update docs
Co-Authored-By: Jeffrey Morgan <jmorganca@gmail.com>
Co-Authored-By: Jay Nakrani <dhananjaynakrani@gmail.com>
Co-Authored-By: Akhil Acharya <akhilcacharya@gmail.com>
Co-Authored-By: Sasha Devol <sasha.devol@protonmail.com>

move the empty response so it's more visible

unused after removing EMBED

- only reload the running llm if the model has changed, or the options for loading the running model have changed
- rename loaded llm to runner to differentiate from loaded model image
- remove logic which keeps the first system prompt in the generation context