backend (memory), frontends: improved history filtering: a "filters" dictionnary is now use to filter, it can have, for now, filtering on: - "body": filter only on the body (equivalent to former "search" parameter, but not case sensitive) - "search": fitler on body + source resource - "types": allowed types - "not_types": forbidden types primitivus now do searching using "search", i.e. source resource is now taken into account (and search is now case insensitive)