* Fix: Avoid renaming when the URLs (before/after) are empty.
* Add: New option to update URLs in the excerpts (no need to use it for most users).
* Update: Avoid double call to the mfrh_url_renamed (seemed to be completely useless).
* Update: Added a new 'size' argument to the mfrh_url_renamed action.
* Update: Optimized queries.
* Add: We can change the page (in the dashboard) by typing it.