[Rivet] Rivet usability

[Hendrik Hoeth]

Hi,

People outside the Rivet developer circle are starting to use Rivet, and
we should strive to make it a pleasant experience for them. But every
time I write an analysis, I curse about having to use monsters like
particle.momentum().pseudorapidity() and particle.momentum().azimuthalAngle()
instead of eta() and phi(). Nobody outside our own little world will
find this intuitive (quite frankly -- I don't either, and I have to look
up the names each time).

Are there any objections against introducing eta(), phi(), and theta()
in the same way we alread have pT() as synonym for polarRadius()?

    Hendrik

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