Change the search to look into tags and series (in addition to book title and author).

re #34, #47, #78

templates/default/header.html

@@ -17,7 +17,6 @@
                     </button>
                 </div>
                 <div class="stop">
-                    <input type="hidden" name="current" value="{{=it.page}}" />
                     <input type="hidden" name="page" value="9" />
                     {{? it.databaseId != ""}}
                         <input type="hidden" name="db" value="{{=it.databaseId}}" />