Function save_project_with_data 

pub fn save_project_with_data(
    path: &Path,
    snap: &ProjectSnapshot,
    embedded: Option<&EmbeddedData<'_>>,
) -> Result<(), IoError>

Write a project snapshot with optional embedded raw data.

When embedded is Some, raw data arrays are written to /data/embedded/ and the mode attribute is set to "embedded". File paths in /data/links/ are always written for provenance.