[Rivet] flat2aida and small numbers

[Hendrik Hoeth]

Hi,

in flat2aida we are writing errors and values as %f, which leads to
lines like this in the aida file:

  <measurement errorPlus="0.000003" value="0.000009" errorMinus="0.000003"/>

Are there any technical reasons (e.g. about the rivet aida reader) not
to use %s instead, which in this example would give us:

  <measurement errorPlus="2.82e-06" value="9.46e-06" errorMinus="2.82e-06"/>

In this example at least we still get something different from zero, but
in other analyses (like the CDF Run-II minbias pT and sum(ET) spectra)
there are bins which are actually being rendered as 0.000000 at the moment.

Hendrik

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