Surface questions over a given threshold

[zealchen]

Proposed fix for #212.

Adding a top n sort function for all questions. The top votes which are unanswered and not hidden will be ranked first.
And the rest are sorted by the current hotness score.

[jonhoo]

I think you should be able to do this more easily by first partitioning by answered||hidden, then sorting by votes, then using split_at to grab the first N, then sorting the tail by score, and then concatenating. Should save you all the custom Ord stuff!

[zealchen]

I think you should be able to do this more easily by first partitioning by answered||hidden, then sorting by votes, then using split_at to grab the first N, then sorting the tail by score, and then concatenating. Should save you all the custom Ord stuff!

Yes! This can be more concise. I have just refactored the code accordingly. Thanks for the suggestion.