We've had support for hiding repositories through the API by issuing

HTTP DELETE requests to the API resource since the 1.6.x timeframe.

After that, archiving of repositories was introduced, which the API

gained support for through a PUT with archive_name=1, which worked but

probably should have been done through a DELETE request.
Now, when performing a DELETE, we archive the repository instead. This

has the same general effect as what we had before, with the benefits

that the repository name could be reused afterward.

Unit tests pass.