Updated meta-model with features from TDL 1.4 specification that would require...

Updated meta-model with features from TDL 1.4 specification that would require transformation of existing model instances.
Differences compared to 1.3:
* Parameter is NamedElement
* DataUse.reduction is MemberReference
+ TestDescription.isLocallyOrdered
* Block.guard is LocalExpression AND multi-valued
* PeriodicBehaviour.period is LocalExpression AND multi-valued
* BoundedLoopBehaviour.numIteration is LocalExpression AND multi-valued
* Assignment.variable is VariableUse
* Interaction.isTrigger moved to Message
+ Message
+ PredefinedFunction
+ MemberReference
+ PredefinedFunctionCall
+ LocalExpression

Change-Id: I02f02cdf6316384a0f6e64ff4d176c7704ee6591