Bug 20446 cannot create protected or private interfaces [code manipulation]
F3 the spec allows creating protected or private nested interfaces but eclipse disallows it (the new interface wizard)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/wizards/NewTypeWizardPage.java
* Hook method that gets called when the type name has changed. The method validates the 
	 * type name and returns the status of the validation.
	 * <p>
	 * Subclasses may extend this method to perform their own validation.
	 * </p>
	 * 
	 * @return the status of the validation
	 */
	protected IStatus typeNameChanged() {
		StatusInfo status= new StatusInfo();
		String typeName= getTypeName();
		
		if (typeName.length() == 0) {
			status.setError(NewWizardMessages.getString("NewTypeWizardPage.error.EnterTypeName")); 
			return status;
		}
		if (typeName.indexOf('.') != -1) {
			status.setError(NewWizardMessages.getString("NewTypeWizardPage.error.QualifiedName")); 
			return status;
		}
		IStatus val= JavaConventions.validateJavaTypeName(typeName);
		if (val.getSeverity() == IStatus.ERROR) {
			status.setError(NewWizardMessages.getFormattedString("NewTypeWizardPage.error.InvalidTypeName", val.getMessage())); 
			return status;
		} else if (val.getSeverity() == IStatus.WARNING) {
			status.setWarning(NewWizardMessages.getFormattedString("NewTypeWizardPage.warning.TypeNameDiscouraged", val.getMessage())); 
			
		}		
		
		if (!isEnclosingTypeSelected()) {