[Rivet] Rivet 2.6.0 release imminent

[Andy Buckley]

Dear all,

I think I've finally fixed all* the bugs that have been blocking the Rivet
2.6.0 release, and merged in the latest batch of contrib analyses. I'm just
testing on lxplus6 and 7 now, but some feedback from testing on your
systems would also be great if you can try the default branches of both
Rivet and YODA -- or the new b1 tarballs in each of their download areas.

There's a *lot* of work behind the scenes in this release. The big stuff is

- addition of a recursive composite structure to Particle, which enables a
lot of cool stuff and is taking us toward an even more unified picture of
particles and jets in the Rivet framework, although the latter is not there
yet.

- new analysis build system, making builds faster and more uniform, and
integration of contrib analyses *much* easier. (PS. Chris G, the code
quality of the ATLAS ones is broadly _excellent_ now. Just make them fill
in the @brief analysis summary in the class docstring!)

- lots of extensions to the filtering and functors system, and improvements
to the detector parametrisation & machinery. In particular there's now a
very lightweight way to pass multiple smearing/efficiency functors in a
list, and they'll be executed sequentially through a uniform interface...
which I suspect no-one actually needs, but people claimed concern about its
absence at Lunga a year ago, so here it is! There be code magic here.

- We can now write gzipped yoda files :-)

That's all for now. If there are no objections to the release, I'll do it
in the next day or two.

Merry Christmas!
Andy

​* Obviously​ not. But no other obvious ones right now...

-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow
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