Allow for multiple results to be sent to Hydrus

[OuterNeptunium]

In my other issue (#12), I mentioned a second enhancement that'd help with my efficiency, and I will specify it here.

It would be quite helpful for my workflow to be able to send more than one result to Hydrus, so long as they're still above the similarity threshold. Combined with the enhancement I suggested in #12, this enhancement would allow me to save time, data, and daily search count.

Hopefully this wouldn't be too difficult to implement alongside index namespaces?