Imports without widths of their own fit their columns to the data

CSV, TSV, JSON, NUON, SQLite and Parquet imports, and tables read from
standard input (012 -, --pipe), kept every column at the default width,
so longer text (demos/data/inventory.csv's items) showed cut short.
Only XLSX and 1-2-3 files carry widths, and region tables were already
fitted. Such imports now widen each column to its widest text in the
header and the first 200 rows, capped at 30, as region tables are
fitted (Sheet.LoadFitWidths); formats that keep widths keep them.

commit

42069ef32f7b62d4e5d03905b79e32dccc981d65

parent

60343c36f87c37a4792ea156d05f447b5d9d4281

author

Dami <dami.etoile@gmail.com>

kind

fix risk score 1.8 of 3, Jev's estimate