* v0.3.13
- [io] add ~emphStrNumber~ arg to ~writeCsv~, ~pretty~ to disable
highlighting of strings that look like numbers via explicit ~"~
- do not lift control flow out of loop bodies even if they do not
touch DF colums / indices
- improve error message for ~add~ of two DataFrames, prints the
mismatching columns
- fix Column conversion to string column from ~char~ input
- add ~item~ to retrieve the single element of a ~Column~ and ~Tensor~
Changelog: