Updating search box and region view logic

[amkwong]

The updates from #42 forces the region view to always have chrom, start, end, tissue, and gene_id, to help preserve and recreate the state of the current view. This leads to a few issues which need to be addressed:

• Some of the logic for handling missing data for the region_view() in pheget/frontend/init.py are now obsolete and need to be removed

• We need to update the logic for the search box to smartly handle the following searches:

1. Single-tissue+chromosome: (need to fill in: best gene -> start and end)
2. Single-gene (gene_id or symbol): (need to fill in: chrom, best tissue, start and end from the gene)
3. chrom+start+end: (need to fill in: best tissue, best gene -> start and end)

• We need to update the searchbox to use the Fetch API to request data from omnisearch instead of the complicated mess it currently uses

[abought]

I see everyone is assigned. Who should be working on this?

Convention with project boards is toassign no one (open ticket, free to claim) or someone (who is then responsible).

[amkwong]

We can leave it open at the moment then and see if anyone wants to claim this.

[amkwong]

#47 rewrote all requests using the Fetch API, and improved some of the search logic.

We still need to address the case in which the user searches for a single variant (chr:pos or rsnum) which cannot be found in our data. Currently, this kind of search leads to an error. I think the most useful way to handle this is to search for the top signal within a +/- 500kb region, then display the gene x tissue region plot containing that top signal.