add anchor and link to heading cells

IPython/frontend/html/notebook/static/css/style.min.css

@@ -934,6 +934,7 b' pre,code,kbd,samp{white-space:pre-wrap;}'
 .js-error{color:darkred;}
 a{text-decoration:underline;}
 p{margin-bottom:0;}
+a.heading-link:link{text-decoration:none;color:inherit;}
 @media print{body{overflow:visible !important;} div#notebook{overflow:visible !important;} .ui-widget-content{border:0px;} #save_widget{margin:0px !important;} #header,#pager,#pager_splitter,#menubar,#toolbar{display:none !important;} .cell{border:none !important;} .toolbar{display:none;}}.rendered_html{color:black;}.rendered_html em{font-style:italic;}
 .rendered_html strong{font-weight:bold;}
 .rendered_html u{text-decoration:underline;}

IPython/frontend/html/notebook/static/js/textcell.js

@@ -516,7 +516,16 b' var IPython = (function (IPython) {'
     HeadingCell.prototype.set_rendered = function (text) {
         var r = this.element.find("div.text_cell_render");
         r.empty();
-        r.append($('<h'+this.level+'/>').html(text));
+        r.append(
+            $('<a/>')
+            .addClass('heading-link')
+            .attr('href', '#' + text)
+            .attr('name', text)
+            .append(
+                $('<h'+this.level+'/>')
+                .html(text)
+            )
+        );
     };
 
 

IPython/frontend/html/notebook/static/less/notebook.less

@@ -468,3 +468,8 b' p {'
 margin-bottom:0;
 
 }
+
+a.heading-link:link {
+  text-decoration: none;
+  color: inherit;
+}