- wide-to-long: support date columns
- wide-to-long: when suggesting "convert to text" in a Quick Fix, show the
first column name. (Previously, because of Python
set()semantics, we showed a random column name.)
- long-to-wide: repair invalid column names
- long-to-wide: fix to handle Var="" rows when the Var column is compressed as "Categorical". Previously, an error occurred.
- long-to-wide: fix to correctly ignore (Key=xyz, Var=NULL) rows when there is no (Key=xyz, Var=not-null) row the Key column is compressed as "Categorical". Previously, an error occurred.
- Make key columns multi-column.
- Rename fields, for consistency.