Bug 161401 [Viewers] Tweak ColumnViewer-API
- Rename getRowPart(Point point) => getViewerRow() - Rename getCell(Point point) => getViewerCell() - Rename setViewerColumn(final int columnIndex, ViewerColumn viewer) => setupEditingSupport - Make setupEditingSupport() private no one from external needs to use this API to set the EditingSupport for an ViewerColumn
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
* @param index
	 * @see ILazyContentProvider
	 * 
	 * @since 3.1
	 */
	public void replace(Object element, int index) {
		TableItem item = getTable().getItem(index);
		refreshItem(item, element);
	}
	/**
	 * Clear the table item at the specified index
	 * 
	 * @param index
	 *            the index of the table item to be cleared
	 * 
	 * @since 3.1
	 */
	public void clear(int index) {
		TableItem item = getTable().getItem(index);
		if (item.getData() != null) {
			disassociate(item);
		}
		table.clear(index);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.StructuredViewer#getRawChildren(java.lang.Object)
	 */
	protected Object[] getRawChildren(Object parent) {