cubicweb-forge #1251796 Be able to specify the "download" URL of a published version [open]

The URL in the "Download" box of a published version is generated to be "myproject_version.tgz"

It would be nice to be able te tell the forge to use a different URL here, or a different URL generation scheme.

We may even want to be able to put several links in the "downlod" box (the sources tgzn the win32 installer(s), etc.).

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