Add: GeoNode selectively Export/Import Layers

[t-book]

https://docs.geonode.org/en/master/intermediate/backup/index.html#geonode-selectively-export-import-layers

[gannebamm]

The section is not shown anymore?

[t-book]

@gannebamm My link from above should show what should be filled. Unfortunately I cannot say why I closed in May :/
However, the section existed Jun 15, 2019 but has been remove at Mar 24, 2020

Would be really interesting if and how this is possible ! (Currently I'm just downloading the data and uploading it again. Further I do have a little management command to transfer data between users. Maybe something for base commands …)