* minor usability improvements for the URI alias suggest

* refactored the SEO form fields so that other modules are less dependent of the SEO module's concrete implementation

* the ModelSaveEvent can now receive the raw post data too (alongside the already filtered post data)

* reworked the saving of the URI aliases to use the core.model.after_save event

* updated the changelog

* reworked the uri alias generation of the gallery picture to use the gallery.model.gallery.after_save event