GH-137 GetLocalisedXGMML Skips outer subgraph(s)

Fixes GH-137

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #138 from GordonSmith/GH-137-GetLocalisedXGMML_Skips_outer_subgraph

GH-137 GetLocalisedXGMML Skips outer subgraph(s)

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>