title: Reload UITableView without reloading header section
body: <p>I have a <code>UITableview</code> with section and index title. When user click on a cell a option view of height 42 gets display in that cell. To display that option I reload the cell. But section header is also getting updated. That gives bizarre animation. How to reload only cell,without getting called for other delegate method like <code>heightForHeaderInSection</code> and <code>viewForHeaderInSection</code>.</p>