Add detected genes into summary table of MultiQC report

[ChristopherBarrington]

I think it may be helpful to include a column in the summary table that shows the number of detected genes for each library. RNA-SeQC output maybe?

[drpatelh]

Possibly looks like something we can add. Looks like it is being maintained here. As mentioned in the usage section we will need to always collapse the GTF file beforehand just to be safe so will need a separate module for this.

MultiQC has native support for it when I last used it too. See here.

The latest version doesn't appear to be on Conda at the mo.