Contaminants

[dominikschm]

• new metric for tool "QualityControl"

input:
FeatureMap (vector of Features) and contaminants Database (vector of FastaEntry)

output:
ratio of # contaminants (# contaminants/ # all peptides) and
ratio of sum of contaminants (sum of contaminants/sum of peptides)

corner case:
no contaminants -> warning

[cbielow]

with regards to mzTab later on, receive the FeatureMap by reference, but do not make it const.
Instead, for every feature, at a new metavalue ( via .setMetaValue("is_contaminant", x)) where int x = 0/1 depending on contaminant status.