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/descriptor/basic/impl/PartDescriptorImpl.java
setLocalLabel((String)newValue);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__LOCAL_TOOLTIP:
				setLocalTooltip((String)newValue);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__LOCAL_IMAGE:
				setLocalImage(newValue);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__HANDLERS:
				getHandlers().clear();
				getHandlers().addAll((Collection<? extends MHandler>)newValue);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__BINDING_CONTEXTS:
				getBindingContexts().clear();
				getBindingContexts().addAll((Collection<? extends String>)newValue);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__ALLOW_MULTIPLE:
				setAllowMultiple((Boolean)newValue);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__CATEGORY:
				setCategory((String)newValue);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__MENUS:
				getMenus().clear();
				getMenus().addAll((Collection<? extends MMenu>)newValue);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__TOOLBAR:
				setToolbar((MToolBar)newValue);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__CLOSEABLE: