[tz] Moving more zones to 'backzone'

[Paul Eggert]

On 8/4/22 03:02, Florian Weimer via tz wrote:
> If we tell them to switch to Europe/Berlin first

Let's not do that. People who use Europe/Stockholm can continue to use 
the name, just as people who use America/Fort_Wayne and Asia/Chongqing 
can still use those names even though their Zones were removed years 
ago. We can treat Stockholm the same way we successfully treated Fort 
Wayne and Chongqing.