AVR Request Table: Implement Upvotes for AVRs

[ChuckKollar]

Feature like 'this worked for me' button available on protocols.io, or the Amazon review system. Answering the question how helpful was this thing to someone else?

Could allow authenticated users to 'upvote' an AVR and display upvote counts to show popularity/consensus of individual antibodies/AVRs

But Ellen and Co need to figure out if they want the simple up/down or a 5-star approach.