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
case ApplicationPackageImpl.CONTRIBUTION__CONTRIBUTION_URI: return BasicPackageImpl.PART__CONTRIBUTION_URI;
				case ApplicationPackageImpl.CONTRIBUTION__OBJECT: return BasicPackageImpl.PART__OBJECT;
				case ApplicationPackageImpl.CONTRIBUTION__PERSISTED_STATE: return BasicPackageImpl.PART__PERSISTED_STATE;
				default: return -1;
			}
		}
		if (baseClass == MContext.class) {
			switch (baseFeatureID) {
				case UiPackageImpl.CONTEXT__CONTEXT: return BasicPackageImpl.PART__CONTEXT;
				case UiPackageImpl.CONTEXT__VARIABLES: return BasicPackageImpl.PART__VARIABLES;
				case UiPackageImpl.CONTEXT__PROPERTIES: return BasicPackageImpl.PART__PROPERTIES;
				default: return -1;
			}
		}
		if (baseClass == MUILabel.class) {
			switch (baseFeatureID) {
				case UiPackageImpl.UI_LABEL__LABEL: return BasicPackageImpl.PART__LABEL;
				case UiPackageImpl.UI_LABEL__ICON_URI: return BasicPackageImpl.PART__ICON_URI;
				case UiPackageImpl.UI_LABEL__TOOLTIP: return BasicPackageImpl.PART__TOOLTIP;
				case UiPackageImpl.UI_LABEL__LOCAL_LABEL: return BasicPackageImpl.PART__LOCAL_LABEL;
				case UiPackageImpl.UI_LABEL__LOCAL_TOOLTIP: return BasicPackageImpl.PART__LOCAL_TOOLTIP;
				case UiPackageImpl.UI_LABEL__LOCAL_IMAGE: return BasicPackageImpl.PART__LOCAL_IMAGE;
				default: return -1;
			}
		}
		if (baseClass == MHandlerContainer.class) {
			switch (baseFeatureID) {
				case CommandsPackageImpl.HANDLER_CONTAINER__HANDLERS: return BasicPackageImpl.PART__HANDLERS;
				default: return -1;
			}