[PATCH cygport] Add a command to make a test release

[Achim Gratz]

Andrew Schulman writes:
> This happened because 4.8.0-1 turns out to be broken, and later versions won't
> build in Cygwin yet. So I had to promote 4.7.8-1 to test. Assuming it's okay,
> shortly I want to promote it to current and dump 4.8.0-1, leaving
>
> prev: 4.7.7-1
> curr: 4.7.8-1

Again, that won't automatically install 4.7.8 for anyone who already
upgraded to 4.8.0 (unless the --force-current switch is given).


Regards,
Achim.
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