use jquery.floatThead rather than DataTables FixedHeader extension

Netdisco/share/views/ajax/report/moduleinventory.tt

@@ -1,5 +1,5 @@
 [% IF opt %]
-  <table id="data-table" class="table table-striped table-bordered table-fixed-header" width="100%" cellspacing="0">
+  <table id="data-table" class="table table-striped table-bordered nd_floatinghead" width="100%" cellspacing="0">
     <thead>
       <tr>
         <th>Device</th>
@@ -16,7 +16,7 @@
     </thead> 
   </table>
 [% ELSE %]
-  <table id="data-table" class="table table-striped table-bordered table-fixed-header" width="100%" cellspacing="0">
+  <table id="data-table" class="table table-striped table-bordered nd_floatinghead" width="100%" cellspacing="0">
     <thead>
       <tr>
         <th>Class</th>
@@ -31,13 +31,6 @@ function capitaliseFirstLetter(string) {
     return string.charAt(0).toUpperCase() + string.slice(1);
 }
 
-function fhForceRedraw(fixedHeaders) {
-    for (var i = 0; i < fixedHeaders.length; i++) {
-        fixedHeaders[i]._fnUpdateClones(true); // force redraw
-        fixedHeaders[i]._fnUpdatePositions();
-    }
-}
-
 $(document).ready(function() {
     var table = $('#data-table').dataTable({
         "deferRender": true,
@@ -100,30 +93,5 @@ $(document).ready(function() {
         ]
     });
 
-    var fixedHeaders = [];
-    $('.table-fixed-header').each(function() {
-        fixedHeaders.push(
-            new FixedHeader(this, {
-            'offsetTop': 40 // offset for bootstrap navbar
-        }));
-    });
-
-    $(window).resize(function() {
-        fhForceRedraw(fixedHeaders);
-    });
-
-    $('.table-fixed-header').on('draw.dt', function() {
-        fhForceRedraw(fixedHeaders);
-    });
-
-    $('#nd_sidebar-toggle-img-out').click(function() {
-        fhForceRedraw(fixedHeaders);
-    });
-
-    $('#nd_sidebar-toggle-img-in').click(function() {
-        fhForceRedraw(fixedHeaders);
-    });
-
-    
 });
-</script>
+</script>