means that find_STIR_config will be called with the filenames, while read_from_file etc won't do anything with it. This makes little sense, especially as that can fail.

For instance, when trying to build with conda, for some reason (probably another bug) the Windows tests fail because it's looking for the file, even if I disable JSON. See conda-forge/stir-feedstock#39 (comment)

Of course, we do install the files always

but it makes us sensitive to things that shouldn't matter.