Metagenotype page treats diploids as multi-allele genotypes

[jseager7]

(Caused by #1871)

The Metagenotype Management page includes diploid genotypes in the table of multi-allele genotypes, which doesn't seem entirely accurate. @kimrutherford I'm not sure if this is really a bug, since it could be intended (maybe expedient) behaviour. Was this supposed to happen?

To reproduce, simply create a diploid genotype and a multi-allele genotype:

Then go to the Metagenotype Management page:

[kimrutherford]

I forgot that the metagenotype page uses its own code for displaying genotypes. We should move the diploids into their own table. I'll work on that.

[kimrutherford]

I'll hold off doing this until we've finished discussing #1941.

[jseager7]

I'm not sure why I marked this as high priority in hindsight, since PHI-base doesn't even need diploids yet. Maybe I didn't know at the time. @kimrutherford I'm going to downgrade the priority for now.

[ValWood]

Is this ticket a duplicate of, or will it be resolved by
#1941
If so, it can close.

[kimrutherford]

It's not a duplicate because this issue is about the metagenotype management page.