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* README cleanups
* Adds documentation
* Categories in the CategoryList plugin are now re-arrangeable via drag-and-drop
as opposed to manually managing a sort metric.
* The Category List view and the Question List pages in different apphooks can
now be presented differently if so required via new Placeholder Fields.
* The older, Static Placeholders still remain for this release, but are marked
in the mark-up as "DEPRECATED". Please use this release to migrate any plugins
in these plugins to their respective PlaceholderField replacements. These will
be remove in the next release.