* Simplified the "new" and "edit" templates by just not supplying the "slug" field in the schema passed to "new" at all. This way new and edit don't have to call snippetAllFields with different parameters, so they can extend one another gracefully.
* Introduced editBase.html and newBase.html, allowing them to be extended in overrides of new.html and edit.html.
* Implemented before, after, from, and to options for snippetAllFields correctly.