mod_admin: remove api dispatch rule, also defined in mod_base.
mod_base: for catinclude, don't assign passed categories to 'id'. Only assign a resource id to id.

Also add the {cat, File, [cat|...]} as an extra template option. This selects a template based on the given categories.
mod_menu: remove console.log message.
core: allow a non-integer category id to be passed to all_flat/2
mod_admin/mod_admin_frontend: preparations to allow creation of resources via the edit page.