[mapserver-dev] Make wms layer groups requestable

[Yves Jacolin]

Hello,

1 year ago Thomas Bonfort worked on a PR to make WMS Layer groups (defined
with wms_layer_groups Layer Metadata items) to be requestable.

That's mean that if a Layer has wms_layer_group=/group1/group2 then group1
can be requested i GetMap request. This is the same behaviour as GROUP
excep that GROUP can have only one group level. This change means that
GROUP could be seen as deprecated.

I worked on a PR for documentation [2]  and I think MIGRATION_GUIDE doesn't
need to be adapted. I worked on a new branch from a newer master branch and
cherry-pick the 3 commits from Thomas Bonfort branch.

My question is what developpers and PSC think about this? We (Camptocamp)
would like to see this merged in the MapServer code base and are ready to
help if changes are needed. If you agree we can close the Thomas PR and
open a new one from my new branch.

Thanks for your feedback.

Y.
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email : yves.jacolin at camptocamp.com
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