Import 1.5.0

Phil Hagelbergrequested to merge
technomancy-guest/fennel2:import-fennel-150 into debian/latest

This brings us up to date with the latest upstream release.

As in !1 (closed), I've added style.md to debian/copyright under Files-Excluded due to licensing conflict. However, a bug in gbp prevents this from being effective at this time. But since the file is not part of the package anyway, I don't think this should be a big issue.

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