Dust off a C union nugget I forgot about to clean up some glorp.
Merge pull request #157 from cgjones/union-cleanup

Dust off a C union nugget I forgot about to clean up some glorp.
Rename --record/--replay to record/replay. Resolves #154.
Merge pull request #159 from cgjones/record-replay

Rename --record/--replay to record/replay. Resolves #154.