add small image of User next to their comments+solution

Ethan did a spike on Dwagn - see http://wagn.indecks.net/wagn/Wagn%2Bdiscussion

That will get overwritten of course, so see the example below, but you'll have to imagine the css changes for now.

Anonymous+Image handles people who are not signed in, but what about people who just haven't uploaded an image yet?

Simplest thing is to put Anonymous+Image by their comments.

If we instead code the "add image" version as the default to new users' +Image cards (image+*rform isn't enough, as it's not invoked when accounts are created), then we get:

• a Wagn-y invitation to upload your image right there, and
• whenever you do upload an image, it will appear by all the comments you've added since this ticket's been done.

Downsides are:

•  this requires a migration to avoid having existing Wagns developing a lot of ugly "ADD +USERNAME" inclusion thingies in new comments
• if people delete their image we get the ugliness anyway (could code to make deletion always wind up with the "add image" image)
• if we ever want to change the image later it would be another hard migration.