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/WizardSelectionPage.java
* The <code>WizardSelectionPage</code> implementation of 
 * this <code>IWizardPage</code> method returns <code>true</code>
 * if there is a selected node.
 */
public boolean canFlipToNextPage() {
	return selectedNode != null;
}
/**	
 * The <code>WizardSelectionPage</code> implementation of an <code>IDialogPage</code>
 * method disposes of all nested wizards. Subclasses may extend.
 */
public void dispose() {
	super.dispose();
	
	for (int i = 0; i < selectedWizardNodes.size(); i++) {
		((IWizardNode) selectedWizardNodes.get(i)).dispose();
	}
}
/**
 * The <code>WizardSelectionPage</code> implementation of 
 * this <code>IWizardPage</code> method returns the first page 
 * of the currently selected wizard if there is one.
 */
public IWizardPage getNextPage() {
	if (selectedNode == null)
		return null;
	boolean isCreated = selectedNode.isContentCreated();
		
	IWizard wizard = selectedNode.getWizard();
	if (wizard == null) {