Metadata can be added to directories by providing a content file such as index.html and placing metadata inside of that, but that's a bit heavy-handed if all that is desired is to for example specify the title of the directory.
Make the directory mummifier recognize a collection metadata file named .-.turf-properties, using the new TURF Properties file format from URF-85. For now this metadata file will only be used if there is no content file (as the metadata can be added to the content file as mentioned above). If there is a content file, Any metadata file for the directory will be ignored with a logged warning.
The source description in this metadata "sidecar" file will be associated with the phantom content file, if any, and therefore will be saved as a target description for the phantom content file, not for the directory itself. For this ticket there will be no target description file saved for the directory itself.