Bug 325852 Add description attribute to MPartDescriptor/MPart
Adding this new attribute we could e.g. show additional informations about a Part in Show View-Dialog, ...
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/application/ui/basic/impl/PartImpl.java
return dirty != DIRTY_EDEFAULT;
			case BasicPackageImpl.PART__BINDING_CONTEXTS:
				return bindingContexts != null && !bindingContexts.isEmpty();
			case BasicPackageImpl.PART__MENUS:
				return menus != null && !menus.isEmpty();
			case BasicPackageImpl.PART__TOOLBAR:
				return toolbar != null;
			case BasicPackageImpl.PART__CLOSEABLE:
				return closeable != CLOSEABLE_EDEFAULT;
		}
		return super.eIsSet(featureID);
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public int eBaseStructuralFeatureID(int derivedFeatureID, Class<?> baseClass) {
		if (baseClass == MStackElement.class) {
			switch (derivedFeatureID) {
				default: return -1;
			}
		}
		if (baseClass == MContribution.class) {
			switch (derivedFeatureID) {
				case BasicPackageImpl.PART__CONTRIBUTION_URI: return ApplicationPackageImpl.CONTRIBUTION__CONTRIBUTION_URI;
				case BasicPackageImpl.PART__OBJECT: return ApplicationPackageImpl.CONTRIBUTION__OBJECT;
				case BasicPackageImpl.PART__PERSISTED_STATE: return ApplicationPackageImpl.CONTRIBUTION__PERSISTED_STATE;
				default: return -1;