[stella] Oystron 2.7 update

["Piero Cavina" <p.cavina@xxxxxxxxxxxxx>]

Here it is, with the new "Defender-inspired" features made possible by the
courtesy of Jim Nitchals. Uh, extra ship each 5,000 points, this seems more
fair than before.

There are about 25 bytes free (not consecutive), and not many hopes to find
others to cut. Some bytes must be available to fix unpredictable bugs, so
there's not really space for new features. Can I release it? :-)

P.

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