defer kronaplot loading

lib/imp.html

@@ -55,7 +55,7 @@
             <li><a href="#preprocess" aria-controls="preprocess" role="tab" data-toggle="tab">Preprocess</a></li>
             <li><a href="#assembly" aria-controls="assembly" role="tab" data-toggle="tab">Assembly</a></li>
             <li><a href="#mapping" aria-controls="mapping" role="tab" data-toggle="tab">Mapping</a></li>
-            <li><a href="#annotation" aria-controls="annotation" role="tab" data-toggle="tab">Annotation</a></li>
+            <li><a id="annottab" href="#annotation" aria-controls="annotation" role="tab" data-toggle="tab">Annotation</a></li>
             <li><a href="#variants" aria-controls="variants" role="tab" data-toggle="tab">Variants</a></li>
             <li><a href="#ratio" aria-controls="ratio" role="tab" data-toggle="tab">Ratio</a></li>
             <li><a href="#overview" aria-controls="overview" role="tab" data-toggle="tab">Workflow overview</a></li>

lib/imp.js

@@ -317,7 +317,7 @@ $('#tabs li:first > a').tab('show');
 
 
 // load kronaplot if people click on tab. Make a lot of errors if loaded from start.
-$('#annotation').on('show.bs.tab', function (e) {
+$('#annottab').on('show.bs.tab', function (e) {
     if($("#MG-kronaplot").attr('src') === undefined){
         $("#ifr-kronaplot").attr('src', 'Analysis/results/MG.gene_kegg_krona.html');
     }