Add a shebang to the .pyz to make it "more executable"

[facundobatista]

This way, people would only need to do chmod +x to it and will be ready to go.

It looks Windows may also support it, according to this conversation

What would happen if we double-click on it in Linux?

[facundobatista]

Removing this from "stable" milestone, as I don't fully understand if this would be beneficial or a problem. We need to study it a little more.

Basically the problem is which the shebang would be.

• /usr/bin/env python3: not all platforms have env there!
• of course we cannot point to a specific Python version, we shouldn't tie to that
• what in windows

OTOH, we could put something, and it will be useful when it matches the platform, and not useful elsewhere. The big question is if we want something that "will work sometimes".