title: Sequencing column in Odoo/Openerp
body: <p>In Odoo Treeview, I can add a sequencing column like this:</p>
  
  <pre><code>&lt;field name="sequence" widget="handle"/&gt;
  </code></pre>
  
  <p>The widget handle support auto arrange sequences by drag and drop.
  But if I shift the first item to another position, the new first item's sequence isn't 1 but another number. My question is:
  <br/>
  <br/>
  1. How can I make the first item's sequence is always 1?
  <br/>
  2. Is there any other way to add a sequencing order column in Odoo Treeview? I just want a column to show row num of items.</p>