0.1.242

Support OpenAI GPT-4o -- this is now the default LLM when no model is specified.

To explicitly specify the LLM, you can do, for example:

import langroid.language_models as lm
llm = lm.OpenAIGPT( lm.OpenAIGPTConfig(chat_model = lm.OpenAIChatModel.GPT4o))

And recall you can run most of the example scripts with a model specified via -m gpt-4o,
and pytests using --m gpt-4o