{ts} update average sn

[TomSmithCGAT]

Adds functions to:

• Add/update average Signal/Noise feature column (PD returns NA if any values are missing :facepalm:)
• Center-median normalisation, allowing for use of reference dataset to normalise against (e.g for TMT phospho studies, where normalisation against total quant makes more sense)
• Count features per protein. E.g for DEqMS where PSM/peptide per protein required

New functions are covered with minimal regression testing.

[codecov[bot]]

Codecov Report

Merging #14 into master will increase coverage by 1.20%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   42.88%   44.09%   +1.20%     
==========================================
  Files          18       21       +3     
  Lines         872      889      +17     
==========================================
+ Hits          374      392      +18     
+ Misses        498      497       -1     

Impacted Files	Coverage Δ
R/count_features_per_protein.R	100.00% <100.00%> (ø)
R/filter_TMT_PSMs.R	100.00% <100.00%> (ø)
R/normalise.R	100.00% <100.00%> (ø)
R/utilities.R	100.00% <0.00%> (+25.00%)	:arrow_up:

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[TomSmithCGAT]

@csdaw - If you have the time, I would appreciate a quick glance over this. Nothing particularly exciting or complicated here...

[csdaw]

Looks good to me :)