Parse columns containing newlines into lists.
Parse columns containing newlines into lists.

* Lists don't exist in CSV, and the easiest solution is to use
  a separator character.  Newlines are visually helpful in the
  actual Excel file and unlikely to show up in the rest of the
  text.

adam-incuna/imperial-painter,adam-thomas/imperial-painter,adam-incuna/imperial-painter,adam-thomas/imperial-painter