BaseConfiguration.clone() does not work with list properties
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                 Key: CONFIGURATION-393
                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-393
             Project: Commons Configuration
          Issue Type: Bug
    Affects Versions: 1.6
            Reporter: Oliver Heger


In the clone() implementation the map storing the configuration data is also 
cloned. For properties with multiple values this map contains lists. Because no 
deep clone is performed these lists are simply copied into the cloned map. So 
if the corresponding properties are changed on either the original or the 
clone, the other object is affected, too.

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