mfakto(c) doesn't support uploading results (either automatically or manually)

[1231234md5]

in the readme, it says that mfacto(c) can't upload results automatically. also, mfacto(c) produce results.txt and not results.json.txt, so the results can't be uploaded manually (mersenne.org only support results.json.txt now.) so mfakto should produce .json.txt format instead of results.txt.