Labelling on volcano plots

[pinin4fjords]

Clicking the 'label' box on volcano plots does not trigger labels. It does work on e.g. MA plots, which may help with debugging

[aforsythe]

"Show labels" on the various plots should be accompanied by an option of how many points to label. Labeling all make the plots unreadable.

[pinin4fjords]

How would you propose to select which points to label? Currently the idea is that you adjust the filters on fold change and turn on labels if there are a manageable number of selected points. I don't know how to reliably pick a subset of points to label otherwise.