[offlineimap] explain how to factorize configuration settings (#177)

[Nicolas Sebrecht]

https://docs.python.org/2.7/library/configparser.html#safeconfigparser-objects
http://pymotw.com/2/ConfigParser/#using-defaults

This seems not to hurt the wanted migration to configparser.

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Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/issues/177
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