wccarleton/multipledispersals: Correction

There was a minor duplication of some cells from one column to the adjacent column in the .csv containing the lithic data (Late Palaeolithic) that was used for the PCA. The data have been corrected and the analyses re-run. See files labeled _corrected for changes. There were no significant differences in the results or interpretations. These changes will be detailed in a correction to the relevant paper.