Header Tabs

### Overview

This is your friendly ATContentTypes tool. It is a frontend to several important functions like

Image scales
  to recreate image scales
Properties
  to set certain properties for album view and more

### Properties

`image_types`
  A list of portal type names to be treated as image. The types must be AT based, have an image field named `image` and implemented the `IImageContent` interface with the api methods `getImage()`, `setImage()` and `tag(scale=None)`.
`folder_types`
  A list of portal types to be treated as subalbums in the photo album view.
`album_batch_size`
  The default batch size for the photo album view.
`album_image_scale`
  The default image scale name for the photo ablum view.
`single_image_scale`
  The default image scale name used when showing a single image.

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