Groups should have a root directory page, just like Users

[Mittineague]

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Improving the Groups page for 1.7

One of the last big things on the 1.7 release list is to improve the groups page. @tgxworld will be working on this in December, so I wanted to gather feedback and make sure we didn’t miss anything. Here’s what I remember about it so far: general cleanup of the groups page design, not a radical redesign but make it more… presentable. show the group avatar (that @neil already worked on) on the group page prominently, since that is how the group is iden…