Add recollq and Python API options to collapse duplicate results

src/doc/user/usermanual.html

@@ -6872,7 +6872,8 @@ text/html       [file:///Users/uncrypted-dockes/projets/bateaux/ilur/factEtCie/r
                   </dd>
                   <dt><span class=
                   "term">Query.execute(query_string, stemming=1,
-                  stemlang="english", fetchtext=False)</span></dt>
+                  stemlang="english", fetchtext=False,
+                  collapseduplicates=False)</span></dt>
                   <dd>
                     <p>Starts a search for <em class=
                     "replaceable"><code>query_string</code></em>, a
@@ -6885,7 +6886,8 @@ text/html       [file:///Users/uncrypted-dockes/projets/bateaux/ilur/factEtCie/r
                   </dd>
                   <dt><span class=
                   "term">Query.executesd(SearchData,
-                  fetchtext=False)</span></dt>
+                  fetchtext=False,
+                  collapseduplicates=False)</span></dt>
                   <dd>
                     <p>Starts a search for the query defined by the
                     SearchData object. If the index stores the