Add parameter ppm to consensusSpectrum and meanMzInts

[jorainer]

I've added the parameter ppm to the consensusSpectrum and meanMzInts functions that allow to group mass peaks from different spectra into the same combined mass peak in a m/z dependent manner (i.e. if their difference in m/z values is smaller than ppm of the m/z of the peaks). This will complement the grouping based on a fixed value (parameter mzd).

In case you are wondering, I did also remove some non-unicode characters in comments as they were breaking devtools::document().

[codecov-io]

Codecov Report

Merging #373 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #373      +/-   ##
==========================================
+ Coverage   71.22%   71.23%   +<.01%     
==========================================
  Files          82       82              
  Lines        8237     8239       +2     
==========================================
+ Hits         5867     5869       +2     
  Misses       2370     2370

Impacted Files	Coverage Δ
R/DataClasses.R	75% <ø> (ø)	⬆️
R/functions-Spectrum.R	88.36% <100%> (+0.05%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6be3d77...6036f88. Read the comment docs.

[lgatto]

Also on Bioc.