remove reshape2; see #201

[sgibb]

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[codecov-io]

Codecov Report

Merging #202 into master will decrease coverage by 0.01%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
- Coverage   71.73%   71.72%   -0.02%     
==========================================
  Files          67       67              
  Lines        7164     7165       +1     
==========================================
  Hits         5139     5139              
- Misses       2025     2026       +1

Impacted Files	Coverage Δ
R/plotting-MSnExp.R	0% <0%> (ø)	⬆️
R/missing-data.R	9.32% <0%> (-0.17%)	⬇️
R/functions-mzR.R	57% <0%> (ø)	⬆️
R/methods-MSnSet.R	56.02% <100%> (ø)	⬆️

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[lgatto]

Pushed on Bioc.