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Previously, `ollama rm model1 model2 modelN` would only delete `model1`. The other model command-line arguments would be silently ignored. Now, all models mentioned are deleted.

* cmd: support OLLAMA_HOST environment variable

This commit adds support for the OLLAMA_HOST environment
variable. This variable can be used to specify the host to which
the client should connect. This is useful when the client is
running somewhere other than the host where the server is running.

The new api.FromEnv function is used to read configure clients from the
environment. Clients wishing to use the environment variable being
consistent with the Ollama CLI can use this new function.

* Update api/client.go
Co-authored-by: Jeffrey Morgan <jmorganca@gmail.com>

* Update api/client.go
Co-authored-by: Jeffrey Morgan <jmorganca@gmail.com>

---------
Co-authored-by: Jeffrey Morgan <jmorganca@gmail.com>

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.

* 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"
```

This reverts commit 360a10ace391a674de60aa7b9b8cb65e8074027c.