bpo-33855: More edits and new minimal tests for IDLE (GH-7761)


Part 2 of 3.  Continues PR GH-7689, changeset ee5ef30.
Edit and add tests for 18 modules, help_about to replace and run.
(cherry picked from commit ea3dc8029ab6a0f1ee6a8a72f1612dea74892e08)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
30 files changed