Rewrite cvsup & portupgrade in C

[Vladimir Dyuzhev]

ehlo.

> Please go take a look at the CVSup webpage and click on the "Why is
> CVSup so fast?" link.  CVSup is far more than a "downloader" and the
> way it is designed makes it inherently multi-threaded.  It's of course
> theoritically possible to write it single-threaded but it would be a
> real nightmare, and it would also be rather stupid IMO.

   I like threads by myself. But looking on the description what that
   threads in CVSup do, I think it could be easely achieved with fork
   or finite state machine. I do not going to insist on it, though.

   Looking forward to see the csup in the *base* distribution.

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