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Removed Tab indentation selection from the Options
dialog.  Not appropriate for IDLE.  Tab indentation default
may still be configured 'manually' by modifying 
config-main.def but that's for experts.  You can switch on
tabs for individual Edit windows using the Format menu.
(Note: the Tab indent option was never finished and
never operable)

Changing the 'screen' indent width in the Options menu
will now be effective if you aren't using tabs (it's always
8 if you are using tabs).

Thanks for the patch and the reminder.