added in loans support, also particular route for book_for_loan without markup used as div content on loan.html page via ajax load

templates/books_for_loan.html

@@ -0,0 +1,17 @@
+	<h3>Loaned Books</h1>
+	<table id="book_table" class="table table-striped table-sm" data-toolbar="#toolbar" data-search="true">
+	  <thead>
+	  <tr class="thead-light"><th>Title</th></tr>
+	  </thead>
+	  <tbody>
+      {% for book in books %}
+        <tr>
+		  {% if book.sub_book_num is defined %}
+		  	<td data-sort="{{book.parent_id}}.{{book.sub_book_num}}"><a href="/book/{{book.id}}">&nbsp;&nbsp;&nbsp;&nbsp;{{book.title}}</a></td>
+		  {% else %}
+		  	<td data-sort="{{book.id}}"><a href="/book/{{book.id}}">{{book.title}}</a></td>
+		  {% endif %}
+		</tr>
+      {% endfor %}
+	</tbody>
+	</table>