X10 outline view shows synthetic constructors

Moving all open items for X10DT 1.7 to X10DT 2.0 since 1.7 has been released.

The outline builder ("Tree Model Builder") should omit any entities that are properly marked synthetic by the compiler front-end.

There used to be code to do this for 1.5; perhaps it's just not checking for the "synthetic mark" in the right way for Polyglot 3/X10 2.0.

Need to investigate whether all such entities are being so marked by the 2.0.1 front-end, or whether the X10DT tree model builder is just neglecting to omit them.

To first order, the outline view shouldn't include any entities that don't actually appear in the source.

I thought Polyglot used to provide a direct way of marking a member/type as "synthetic" (i.e. compiler-generated). If so, this should be used to prune such entities from the outline view. If not, Polyglot also provides the static Position.COMPILER_GENERATED that might be used to identify the synthetic entities.

Need to investigate further.

The compiler doesn't properly mark synthetic constructors with Position.isCompilerGenerated(), so as a work-around, the X10TreeModelBuilder now also asks whether the textual extent is empty.

bulk close of all resolved issues as part of closing 2.0.4 items.