pdf: add and document MetaFixer::wrapup() method

src/doc/user/usermanual.html

@@ -20,8 +20,8 @@ alink="#0000FF">
     <div class="titlepage">
       <div>
         <div>
-          <h1 class="title"><a name="idp35245072" id=
-          "idp35245072"></a>Recoll user manual</h1>
+          <h1 class="title"><a name="idp56557776" id=
+          "idp56557776"></a>Recoll user manual</h1>
         </div>
 
         <div>
@@ -109,13 +109,13 @@ alink="#0000FF">
                 multiple indexes</a></span></dt>
 
                 <dt><span class="sect2">2.1.3. <a href=
-                "#idp40818624">Document types</a></span></dt>
+                "#idp62130176">Document types</a></span></dt>
 
                 <dt><span class="sect2">2.1.4. <a href=
-                "#idp40843200">Indexing failures</a></span></dt>
+                "#idp62154272">Indexing failures</a></span></dt>
 
                 <dt><span class="sect2">2.1.5. <a href=
-                "#idp40850208">Recovery</a></span></dt>
+                "#idp62161280">Recovery</a></span></dt>
               </dl>
             </dd>
 
@@ -1017,8 +1017,8 @@ alink="#0000FF">
           <div class="titlepage">
             <div>
               <div>
-                <h3 class="title"><a name="idp40818624" id=
-                "idp40818624"></a>2.1.3.&nbsp;Document types</h3>
+                <h3 class="title"><a name="idp62130176" id=
+                "idp62130176"></a>2.1.3.&nbsp;Document types</h3>
               </div>
             </div>
           </div>
@@ -1131,8 +1131,8 @@ indexedmimetypes = application/pdf
           <div class="titlepage">
             <div>
               <div>
-                <h3 class="title"><a name="idp40843200" id=
-                "idp40843200"></a>2.1.4.&nbsp;Indexing
+                <h3 class="title"><a name="idp62154272" id=
+                "idp62154272"></a>2.1.4.&nbsp;Indexing
                 failures</h3>
               </div>
             </div>
@@ -1172,8 +1172,8 @@ indexedmimetypes = application/pdf
           <div class="titlepage">
             <div>
               <div>
-                <h3 class="title"><a name="idp40850208" id=
-                "idp40850208"></a>2.1.5.&nbsp;Recovery</h3>
+                <h3 class="title"><a name="idp62161280" id=
+                "idp62161280"></a>2.1.5.&nbsp;Recovery</h3>
               </div>
             </div>
           </div>
@@ -2042,8 +2042,20 @@ class MetaFixer(object):
             pass
     
         return txt
+    def wrapup(self, metaheaders):
+        pass
         
 </pre>
+
+          <p>If the 'metafix()' method is defined, it is called for
+          each metadata field. A new MetaFixer object is created
+          for each PDF document (so the object can keep state for,
+          for example, eliminating duplicate values). If the
+          'wrapup()' method is defined, it is called at the end of
+          XMP fields processing with the whole metadata as
+          parameter, as an array of '(nm, val)' pairs, allowing an
+          alternate approach for editing or adding/deleting
+          fields.</p>
         </div>
 
         <div class="sect2">