In class/Microsoft.Build.Engine/Microsoft.Build.BuildEngine:

In class/Microsoft.Build.Engine/Microsoft.Build.BuildEngine:

	* Expression.cs (ParseOptions): New enum. Replace the bool params
	of exression.Parse with this. Add option to control expansion of
	metadata references.
	(CopyToExpressionCollection): Track api changes.

	Update all expr.Parse calls to use the new enum.
	* BuildItem.cs, BuildProperty.cs, BuildTask.cs, Import.cs,
	Target.cs, TargetBatchingImpl.cs, UsingTask.cs: Track api changes.

	* BatchingImplBase.cs: Track api changes. Allow metadata refs
	in task attributes.
	* ConditionFactorExpression.cs: Allow metadata refs in conditions.
	* ItemReference.cs: Allow metadata in transforms.
	* TaskEngine.cs: Allow metadata refs.

	* MetadataReference.cs (.ctor): Add a 'original string' param.

In class/Microsoft.Build.Tasks/Test/Microsoft.Build.Tasks:

	* TaskBatchingTest.cs: Add new tests for metadata refs found
	in places other than task attributes.

svn path=/trunk/mcs/; revision=140998