feat(documentfilter): Add SearchDoc::getFamily() method (refs #4580)

Also:
- Change SearchDoc::addFilter() to accept a \Dcp\DocumentFilter object as input
feat(documentfilter): Correct PHP Notice in DocCtrl->computeDProfil() (refs #4580)
fix(thesaurus): Resolve logical name when setting thesaurus values (refs #4748)
feat(docrel): Update docrel's titles when a document's title is changed (refs #4767)

Also:
- Add support for attributes with option "multiple=yes"
feat(SearchDoc): Add \Dcp\DocumentFilter classes (refs #4580)