Add local observation count to variant list page frequency pop-up

[henrikstranneheim]

No description provided.

[moonso]

What do you think about this one @robinandeer ?

[moonso]

I guess that if are satisfied with information from the loqusdb dump this could be done easy. Otherwise it could slow down the variants page a lot.
Would that be ok @henrikstranneheim ?

[henrikstranneheim]

Yes, that would be fine I think as long as it clear that it is the archived version.