slowly phasing out mailing lists

CHANGELOG.txt

 3.3.1 (Work-in-progress): new Min and Max functions on constants (at parse
-time); fixed regression in trees of edges in 2D.
+time); fixed regression in trees of edges in 2D; small bug fixes.
 
 3.3.0 (December 21, 2019): improved support for curved elements; added support
 for auto-similar trees of edges (e.g. for sliding surfaces in 3D); update for

doc/getdp.html

@@ -148,7 +148,6 @@ Public License (GPL)</a>:
         <a href="bin/MacOSX/getdp-git-MacOSXc.tgz">MacOS</a>
       <li>Download the latest automatic
         <a href="src/getdp-git-source.tgz">source code</a> snapshot
-      <li>Read the latest automatic <a href="dev/doc/texinfo/getdp.html">reference manual</a> snapshot
       <li>Access the Git repository: '<code>git clone
           <a href="https://gitlab.onelab.info/getdp/getdp.git">https://gitlab.onelab.info/getdp/getdp.git</a></code>'
     </ul>
@@ -178,10 +177,14 @@ in your work (books, articles, reports, etc.).
 <h2><a name="Documentation"></a>Documentation</h2>
 
 <ul>
-  <li><a href="doc/texinfo/getdp.html">Reference manual</a>
+  <li><a href="doc/texinfo/getdp.html">GetDP reference manual (stable release)</a>
     (also available in
     <a href="doc/texinfo/getdp.pdf">pdf</a> and in
     <a href="doc/texinfo/getdp.txt">plain text</a>)
+  <li><a href="dev/doc/texinfo/getdp.html">GetDP reference manual (development version)</a>
+    (also available in
+    <a href="dev/doc/texinfo/getdp.pdf">pdf</a> and in
+    <a href="dev/doc/texinfo/getdp.txt">plain text</a>)
   <!-- li><a href="doc/slides_getdp.pdf">Short presentation</a -->
   <li><a href="https://gitlab.onelab.info/doc/tutorials/wikis/home">Step-by-step
       tutorials</a> and <a href="https://gitlab.onelab.info/doc/models/wikis/home">various
@@ -192,7 +195,7 @@ in your work (books, articles, reports, etc.).
     of changes and the <a href="https://gitlab.onelab.info/getdp/getdp/issues">bug
       tracking</a> database
   <li><a href="https://gitlab.onelab.info/getdp/getdp/blob/master/CHANGELOG.txt">Changelog</a>
-  <li>Mailing lists:
+  <!-- li>Mailing lists:
     <ul>
       <li><a href="http://onelab.info/mailman/listinfo/getdp/">getdp</a> (archived
         <a href="http://onelab.info/pipermail/getdp/">here</a>) is the public mailing
@@ -202,7 +205,7 @@ in your work (books, articles, reports, etc.).
         (archived <a href="http://onelab.info/pipermail/getdp-announce/">here</a>) is a
         moderated ("read-only") list for announcements about new
         releases and other GetDP news
-    </ul>
+    </ul -->
 </ul>
 
 <p>