- Issue #16893: Update Idle doc chapter to match current Idle and add new

information.

- Issue #3068: Add Idle extension configuration dialog to Options menu.

Changes are written to HOME/.idlerc/config-extensions.cfg.

Original patch by Tal Einat.

- Issue #16233: A module browser (File : Class Browser, Alt+C) requires a

editor window with a filename. When Class Browser is requested otherwise,

from a shell, output window, or 'Untitled' editor, Idle no longer displays

an error box. It now pops up an Open Module box (Alt+M). If a valid name

is entered and a module is opened, a corresponding browser is also opened.

- Issue #4832: Save As to type Python files automatically adds .py to the

name you enter (even if your system does not display it). Some systems

automatically add .txt when type is Text files.

- Issue #21986: Code objects are not normally pickled by the pickle module.

To match this, they are no longer pickled when running under Idle.