Merge add location code in `add-location`and `new-community` command

[clangenb]

While merging we should use the logic that has been introduced in the new-community command, which batches the locations as defined per cli argument.

[brenzi]

To be precise: you don't want to merge the commands, you just want to dedup code, right?

[clangenb]

Yes, only dedup code.