Cleans the timestamp added to an URL by |timestamp (or by images filters).
Example:
[(#LOGO_ARTICLE|image_reduire{400,0}|extraire_attribut{src})]
generates a string like IMG/arton1.jpg?1455796719
If we apply the filter |supprimer_timestamp to the previous code, we get the address of the thumbnail without the timestamp:
[(#LOGO_ARTICLE|image_reduire{400,0}|extraire_attribut{src}|supprimer_timestamp)]
generates a string like IMG/arton1.jpg.