Roundrobin sorting option

[KNejad]

I first wrote this issue for the original Flym repo, but since that's been archived I figured I'd add it here as well to see if this is something anybody would like: FredJul#750

It would be great if there was an option to sort the feeds in a Round Robin way.

So basically if I have posts from A, B and C instead of sorting newest to oldest you would sort them like this:

A1, B1, C1, A2, B2, C2...

The reason I would love this feature is because I have some feeds which rarely get published (e.g. Arch Linux news) and some that are filling up my news feed (e.g. Stack Exchange favorite tags). It gets annoying having to go through 5-6 Stack Overflow posts in a row to get to something from another source, and I also never get to see any posts from Arch Linux since they are very far down the list.

With this new sort order I would be able to read posts from all my sources regardless of how many each post.