Create partial for adding feed subscriptions to a screen and weighting them about concerto HOT 3 CLOSED

weights should be a float me thinks. I think when we weight, we naturally think of percentages which lends itself to floats.

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We started out using floats (they might have been doubles) and a percentage-based weighting system in Concerto 1 but it turned out to be too confusing so we simplified everything to our current 1-5 integer based weights.

The first shuffling algorithm would pull content from a subscription N% of the time, so all the subscription weights would have to add up to 100%. We mever exposed this level of granularity in an interface TMK, resulting in math that really dumbed things down a lot. As an example, setting 1 feed to "Show alway" which had a weight of 80% and 5 feeds to "Meh" with a weight of 10% meant that you ended up with 1 feed @ 62% and 5 feeds at 7.6% which probably wasn't what you intended to do. Our interface wasn't clever enough to show you the relative nature of the weighting since it had a very limited set of options and the math behind the scenes shouldn't have normalized as naively as it did.

We switched to 1-5 integers and the current shuffling algorithm which maintained the same relative nature (setting all your feeds to "very frequently" scoring at 5 is the same as everything at "meh" scoring at 1) but it makes is much clearer that there was no normalization going on behind the scenes. When you revisit the panel the weights haven't changed because we don't try to force anything to add up to anything.

Using floats provides us with the most flexibility right now since we can store 1-5 or % numbers as needed. Feel free to make the column change.

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Moving this to #73

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