Add new group in Layers Panel above selected layer

[qgib]

Author Name: Bernd Vogelgesang (Bernd Vogelgesang)
Original Redmine Issue: 14284

Redmine category:gui

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New groups are always created at the end of the layer list.
It would be more convenient when they were entered above the selected layer, cause it's more likely that users would like to create it there and not at the very end of the list.

Current version: 2.12.3

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• easy_fix was configured as 0

[alexbruy]

Now if there is a selected layer group created above it and the layer it moved into a group.