Mbio: consider gsea-type app but for microbial signatures

[d-callan]

From microbiomeComputations created by d-callan: VEuPathDB/microbiomeComputations#67

Dan has been talking about this, and its a cool idea.

if we decide to do this, itll result in mockups and a load of tickets, etc. but i think keeping a placeholder ticket, which could one day become the ticket for the compute itself, is helpful... so here it is :)