[bug #2901] (thuban) Duplicate Layer doesn't copy classification field (column)

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2901
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Subject: Duplicate Layer doesn't copy classification field (column)

Duplicate Layer doesn't copy classification field (column) reference. As a
consequnce the duplicated layer has a worthless classification since it is not
related to any attribute field.

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