Qualimap: BamQC: add percentage on target

[FerriolCalvet]

Solving this issue: #2019

• This comment contains a description of changes (with reason)
  This is explained in the issue referenced above. But basically I am adding an extra column to the output table of Qualimap BAMQC. This value is already present in the default output of Qualimap BAMQC. It is the (97.14%).
  

• CHANGELOG.md has been updated

[vladsavelyev]

Thank you! Looks good to me.

I think it make sense to change the title of the existing regions_mapped_reads metric from "{} Aligned" to "{} On target", otherwise it has the same name as the overall number of mapped reads.

[vladsavelyev]

Just rename the regions_mapped_reads metric from "{} Aligned" to "{} On target", please :)

[ewels]

Looks good! Couple of minor pedantic comments, will fix quickly myself now.

[ewels]

I realised that several of my review comments also applied to existing code within the module! So was a good opportunity to clean those bits up as well ✅

Many thanks for this @FerriolCalvet!