update find_peaks algorithm

This commit updates the find peaks algorithm with several improvements which
together drastically improve its ability to find Cerenkov rings:

- when computing the Hough transform, instead of charge we weight each PMT hit
  by the probability that it is a multi-photon PMT hit
- we don't subtract off previously found rings (this makes the code simpler and
  I don't think it previously had a huge effect)
- ignore PMT hits who are within approximately 5 degrees of any previously
  found ring (previously we ignored all hits within the center of previously
  found rings)
- ignore PMT hits which have a time residual of more than 10 nanoseconds to
  hopefully ignore more reflected and/or scattered light
- switch from weighting the Hough transform by exp(-fabs(cos(theta)-1/n)/0.1)
  -> exp(-pow(cos(theta)-1/n,2)/0.01). I'm still not sure if this has a huge
  effect, but the reason I switched is that the PDF for Cerenkov light looks
  closer to the second form.
- switch to calling quad with f = 1.0 in test-find-peaks (I still need to add
  this update to fit.c but will do that in a later commit).

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