Code cleaning and bug fixes

Some cleaning and fixes including:
- Cleaned up code for ContinuousLR factor which is not supported yet.
- Fixed the well-known Akka non-terminating bugs by try-catch in `DeepDive.run`
- Reduced test output by using --quiet in sampler
- Fixed a warning that happens for a clean `make build`
- Skipped chunking on GP to ensure `make test` work on GP
- Fixed some occasional testing bugs

See the commit messages for detail.
There is a chance that `num_incorrect` is 0 in `bucket=9`, in this case `num_incorrect` will be NULL rather than 0 in the has_spouse_is_true_calibration table. Not sure if there is a design decision there or is this a bug. But this query will try to compute `X / (X + NULL)` and get NULL as result, which breaks the result.