------------------
* Only show hidden images when in editing mode (introduced in raptus.article.core 2.0b13)
* Add a property ``gallery_rel_attribute`` to be able to use a js-gallery
product other than `Products.jsImagePopups`.
eg set it to ``prettyPhoto`` to use `collective.prettyphoto`.
[fRiSi]
* Added property to configure the maximum number of gallery items
to be displayed.
[fRiSi]
* For SEO reasons, the images link to article/image1/view now (used
to link to article/image1/image in preview size)
An additional javascript fixes the link for the javascript galleries.
[fRiSi]