Bug 317954 Version deltas file so that incompatible changes will be ignored
The deltas file needs to be versioned so that incompatible changes will be discarded allowing the workbench to be constructed as if there were no deltas in existence.
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/ui/internal/workbench/XMLModelReconciler.java
if (reference instanceof MCommandParameter) {
			EMap<EObject, EList<FeatureChange>> objectChanges = changeDescription
					.getObjectChanges();
			boolean parametersChanged = false;
			for (Entry<EObject, EList<FeatureChange>> entry : objectChanges.entrySet()) {
				EObject key = entry.getKey();
				if (key instanceof MCommand) {
					for (FeatureChange change : entry.getValue()) {
						if (change.getFeatureName().equals(COMMAND_PARAMETERS_ATTNAME)) {
							List<?> parameters = (List<?>) change.getValue();
							for (Object parameter : parameters) {
								if (parameter == reference) {
									return key;
								}
							}
							parametersChanged = true;
							break;
						}
					}
					break;
				}
			}
			return parametersChanged ? null : reference.eContainer();
		}
		if (reference instanceof MParameter) {
			EMap<EObject, EList<FeatureChange>> objectChanges = changeDescription
					.getObjectChanges();
			boolean parametersChanged = false;
			for (Entry<EObject, EList<FeatureChange>> entry : objectChanges.entrySet()) {
				EObject key = entry.getKey();