Removes default Category taxonomy.
Hides slugdiv on edit screens.
Removes min-height from empty edit metaboxes.
Re-implements Folio as a custom post.
Loads Post model as a custom post.
Migrates Sharedaddy settings.
Improves display of descriptions on custom fields.
Hides uneeded metaboxes on Post edit screens.
Adds Post custom post class.
Updates labels and menu placement.
Updates Atlas.

* support for using default Post class as a CustomPost,
* un-declares CustomPost tabs; so they won't be shared on child classes.