[Rivet] API documentation?

[Hendrik Hoeth]

Thus spake Hendrik Hoeth (hendrik.hoeth at cern.ch):

> Do we actually have a usable API documentation which we can link to in
> the tutorials? I've just tried to find bookHistogram1D on our Doxygen
> website (which says Rivet 1.1.2 but the content is more current) and
> failed miserably.

I finally found bookHistogram1D(). Hopefully the student's Doxygen
experience is better than mine.

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