Compatibility with gpt4all-j

[rabidcopy]

It appears over at gpt4all they have moved towards gpt-j. As such they have released a ggml. They now direct users to use https://github.com/nomic-ai/gpt4all-chat for inference. Most of this seems to be based on ggerganov's ggml repo. One thing of note is their gptj.cpp isn't up to date with ggml-org/ggml@0265f08. So first thought is, "huh, wonder if this will load fine on koboldcpp?", answer is, yep!

[LostRuins]

Yeap, KoboldCpp should handle all formats automatically as it infers the file type at load time. Let me know if a specific format is broken.