automatic cache creates 2 directories

Both caches contain a cached file, one under cache_dir/cache/flattened_doi/file and one under cache_dir/flattened_doi/cache/file. We are separating the the cache_dir from the raw data storage already, so we don’t need to put a cache subdirectory under that. In principle, cache_dir/flattened_doi/file would be possible but just in case that raw and cache directory coincide, cache_dir/flattened_doi/cache/file is a good alternative. This way, the user also has the option to group all raw and cached files belonging to one data set under one directory with this setting.

[davidsebfischer]

Yes good idea, the default now cache_dir/flattened_doi/cache/file then becomes data_dir/flattened_doi/cache/file which is good because studies are grouped together!

[le-ander]

same for meta_path