Set a custom `query_var` for post type, then hook the `parse_request` action (which is after the post type has been stripped out if it is not publicly queryable) and forcibly set the post type to whatever our custom post type query var is. #4

Issues with the pretty URL.
Handle `post_type` differently when constructing the URL. #4
Rename `fcts_post_type` to `facetious_post_type`.