apachedex: Display row header when hovering its cells (report tables).

When the table is large and requires scrolling, it becomes difficult
to read so add 'title' attribute to <tr> on 'Stats per module' and
'Hits per status code' tables. For example when hovering a particular
cell on a module row, it display the module name.

/reviewed-on !3

apachedex/__init__.py

@@ -454,7 +454,7 @@ class GenericSiteStats(object):
     for status, data_dict in sorted(filtered_status.iteritems(),
         key=ITEMGETTER0):
       has_errors |= statusIsError(status)
-      append('<tr><th>%s</th>' % statusAsHtml(status))
+      append('<tr title="%s"><th>%s</th>' % (status, statusAsHtml(status)))
       append(hitTd(sum(data_dict.itervalues()), status))
       for column in column_list:
         append(hitTd(data_dict[column], status))
@@ -673,19 +673,19 @@ class ERP5SiteStats(GenericSiteStats):
       append('</td>')
     for module_id, data_dict in sorted(filtered_module.iteritems(),
         key=ITEMGETTER0):
-      append('<tr class="group_top"><th rowspan="2">%s</th>'
-        '<th>module</th>' % module_id)
+      append('<tr class="group_top" title="%s (module)"><th rowspan="2">%s</th>'
+        '<th>module</th>' % (module_id, module_id))
       hiddenGraph(self.module[module_id][False], module_id + ' (module)')
       apdexAsColumns(data_dict[False])
-      append('</tr><tr class="group_bottom"><th>document</th>')
+      append('</tr><tr class="group_bottom" title="%s (document)"><th>document</th>' % module_id)
       hiddenGraph(self.module[module_id][True], module_id + '  (document)')
       apdexAsColumns(data_dict[True])
       append('</tr>')
-    append('<tr class="group_top group_bottom"><th colspan="2">site search'
+    append('<tr class="group_top group_bottom" title="site search"><th colspan="2">site search'
       '</th>')
     hiddenGraph(self.site_search, 'site search')
     site_search_overall = apdexAsColumns(filtered_site_search)
-    append('<tr class="group_top group_bottom"><th colspan="2">other</th>')
+    append('<tr class="group_top group_bottom" title="other"><th colspan="2">other</th>')
     hiddenGraph(self.no_module, 'other')
     no_module_overall = apdexAsColumns(filtered_no_module)
     append('</tr></table><h2>Per-level overall</h2><table class="stats"><tr>'