Revert "manuals in browser rc (#4975)" (#5071)

This reverts commit 88be2a2.

We're encountering some issues with opening the docs on certain systems.
We need to figure out a better way of handling this. Reverting for the time being.

src/gui/QvisHelpWindow.C

@@ -1405,10 +1405,6 @@ QvisHelpWindow::displayHome()
 //   Kathleen Bonnell, Thu Apr  8 17:20:52 PST 2010
 //   Convert file to url so it will work on windows.
 //
-//   Alister Maguire, Thu Aug 13 16:50:36 PDT 2020
-//   Updated so that the VisIt manuals are rendered in the user's default
-//   web browser.
-//
 // ****************************************************************************
 
 bool
@@ -1421,24 +1417,7 @@ QvisHelpWindow::displayPage(const QString &page, bool reload)
         QString file(CompleteFileName(page));
         if(QFile(file).exists())
         {
-            //
-            // We open the VisIt manuals using the user's default browser. All
-            // other pages are rendered inside of the widget using Qt.
-            //
-            if (page == manualPath)
-            {
-                helpBrowser->clear();
-                if (!QDesktopServices::openUrl(QUrl::fromLocalFile(file)))
-                {
-                    Error(tr("The VisIt Manuals were unable to be "
-                        "opened."));
-                }
-            }
-            else
-            {
-                helpBrowser->setSource(QUrl::fromLocalFile(file));
-            }
-
+            helpBrowser->setSource(QUrl::fromLocalFile(file));
             helpFile = page;
             retval = true;
         }

src/resources/help/en_US/relnotes3.1.3.html

@@ -64,7 +64,6 @@
   <li>Added the Tessellate operator, which tessellates high order elements into linear elements. The following high order cell types are supported: QUADRATIC_EDGE, CUBIC_LINE, LAGRANGE_TRIANGLE, QUADRATIC_TRIANGLE, BIQUADRATIC_TRIANGLE, LAGRANGE_QUADRILATERAL, BIQUADRATIC_QUAD, QUADRATIC_QUAD, LAGRANGE_TETRAHEDRON, QUATRADIC_TETRA, LAGRANGE_HEXAHEDRON and QUADRATIC_HEXAHEDRON. All unsupported types will be removed from the mesh.</li>
   <li>Added parallel support for Remap operator.</li>
   <li>Added host profiles for the Lawrence Livermore National Laboratory's Tron system. Removed the host profiles for the Lawrence Livermore National Laboratory's Cmax system.</li>
-  <li>Enhanced the VisIt Help menu such that the VisIt Manuals are opened in the user's default web browser instead of being rendered in the GUI window.</li>
 </ul>
 
 <a name="Dev_changes"></a>