Bug 29163 SafeRunnable needs to be accessible in JFace
We need to be able to access the SafeRunnable in JFace in order that some error protection can be added to preferences and properties dialogs.
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/wizard/Wizard.java
*  <li><code>setHelpAvailable</code></li>
 *  <li><code>setDefaultPageImageDescriptor</code></li>
 *  <li><code>setDialogSettings</code></li>
 *  <li><code>setNeedsProgressMonitor</code></li>
 *  <li><code>setTitleBarColor</code></li>
 *  <li><code>setWindowTitle</code></li>
 * </ul>
 * </p>
 * <p>
 * Subclasses may override these methods if required:
 * <ul>
 *  <li>reimplement <code>createPageControls</code></li>
 *  <li>reimplement <code>performCancel</code></li>
 *  <li>extend <code>addPages</code></li>
 *  <li>reimplement <code>performFinish</code></li>
 *  <li>extend <code>dispose</code></li>
 * </ul>
 * </p>
 * <p>
 * Note that clients are free to implement <code>IWizard</code> from scratch
 * instead of subclassing <code>Wizard</code>. Correct implementations of
 * <code>IWizard</code> will work with any correct implementation of 
 * <code>IWizardPage</code>.
 * </p>
 */
public abstract class Wizard implements IWizard {
	/** 
	 * Image registry key of the default image for wizard pages
	 * (value <code>"org.eclipse.jface.wizard.Wizard.pageImage"</code>).
	 */