How to rename a port

[Marko Käning]

>> Thanks for the info, I'll try to include that in the Guide some day.
> It's now in the guide:
> http://guide.macports.org/#development.practices.rename-replace-port
Is it? I haven't update it.
The above link points to text which doesn't yet contain information about the "obsolete" port group.
I would need to have a look at it first and test it myself before I'd dare to write about it.