deleted ports

[Lutz Kittler]

Hi,

I had a problem with the Mesa3-Port. Someone told me
that the port has moved to libglut.
The problem was, that /usr/ports/graphics/Mesa3 was 
not deleted and the only in this directory was README.html.
When I deleted the file and the mesa-directory libglut was
installed and everything was okay.

So I have 2 questions:
1. Why the mesa-port dir wasnt deleted ? 
2. Is there anywhere a description of the ports mechanism
  inclusive meaning of files like MOVED?

 Thanks, lutz