segyio-1.7.0 upgraded to upstream, minor rules changes

[Jørgen Kvalsvik]

> I looked quickly at it and I realize that the debian/copyright file is
> incomplete. There is stuff under external/catch2/ that is licensed
> under the Boost Software License. Please add this information.

I've added the licence entry for catch2, and the boost licence text. An oversight on my part.

- J


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