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configuration files, and if a user file becomes empty, it will be
deleted.

The configuration database maps options to values.  Conceptually, the
database keys are tuples (config-type, section, item).  As implemented,
there are  separate dicts for default and user values.  Each has
config-type keys 'main', 'extensions', 'highlight', and 'keys'.  The
value for each key is a ConfigParser instance that maps section and item
to values.  For 'main' and 'extenstons', user values override
default values.  For 'highlight' and 'keys', user sections augment the
default sections (and must, therefore, have distinct names).

Throughout this module there is an emphasis on returning useable defaults
when a problem occurs in returning a requested configuration value back to
idle. This is to allow IDLE to continue to function in spite of errors in
the retrieval of config information. When a default is returned instead of
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