Export groupnames(ds....

[haavardhvarnes]

Possibly a pull request but it seems logical to have the possibility to iterate all groups

[Alexander-Barth]

Did you try this to iterate over all subgroups?

for (groupname,group) in ds.groups
    # all groups
    @show (groupname,group)
end

https://alexander-barth.github.io/NCDatasets.jl/stable/dataset/#Common-methods
Or do you need the group names without iterating?