Search should return a vec of results

[Iizuki]

Is your feature request related to a problem? Please describe.

Currently search errs if there are more than one result. I don't think that this is really the library's job to do. We should just return a Vec of results and let the user decide how many results they want.

This would function as a lightweight alternative to the more involved streaming searches for small result sets.

While at it we could get rid of the multivalued flavor too.