GGU-SETTLE: "Duplicate layer" menu item

Sometimes it is necessary to duplicate a layer into an existing system. Using the previously described menu items this is strenuous.

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A new layer can be defined by partitioning an existing layer. The depth range of the selected layer is divided into 2 new layers with the same depth. The final depth of the constrained modulus profile thus remains neutral. The soil properties of the selected layer are adopted for both new sub-layers.