Bug 172000 [Wizards] WizardNewFileCreationPage should support overwriting existing resources
In the WizardNewFileCreationPage, there should be a method to set allowExistingResources flag for ResourceAndContainerGroup member. It is useful when both "create" and "renew/overwrite" operations are meaningful for a wizard.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardNewFileCreationPage.java
}
			resource = parent;
			parent = parent.getParent();
		}
		return resource.getWorkspace().getRoot();
	}
	/**
	 * Returns the current full path of the containing resource as entered or
	 * selected by the user, or its anticipated initial value.
	 * 
	 * @return the container's full path, anticipated initial value, or
	 *         <code>null</code> if no path is known
	 */
	public IPath getContainerFullPath() {
		return resourceGroup.getContainerFullPath();
	}
	/**
	 * Returns the current file name as entered by the user, or its anticipated
	 * initial value.
	 * <br><br>
	 * The current file name will include the file extension if 
	 * the preconditions are met.
	 * @see WizardNewFileCreationPage#setFileExtension(String)
	 * 
	 * @return the file name, its anticipated initial value, or
	 *         <code>null</code> if no file name is known
	 */
	public String getFileName() {
		if (resourceGroup == null) {
			return initialFileName;