Small edits to points in Points of Unity clear support count

[SwartzCr]

Currently any edit to a Point in Points of Unity will clear the support count of it. This becomes problematic when people are trying to add minor content to a point. Example: I'm trying to use PoU for figuring out songs for Porchfest. My housemate wants to add a link to the tabs for a certain song to its PoU point, but doing so would cause its support to be cleared. Possibly fixes: allow people to decide if they've made a minor change, and clear based on that allow a comment box where people can add minor content