Image sizes

Some important changes to Image sizes...

1. If you are on a *Content page* (e.g. the article page) then use *Main Picture*

2. If you are on an *Index page* (e.g. tag page or front) then use *Trail Picture*

3. Profiles now understand how to find the best image based on their width. We were for example getting the largest image and then knocking it down to 220px. We now will use the closest crop equal to or larger than 220px. This should considerably ease load on the image server.

I killed off some no longer used AB test templates rather than migrate them.

Quite a large changeset, but we use images all over.