Dwave-system

New Features
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* Add `LeapHybridCQMSampler`
* Backport support for legacy solver config override (see https://github.com/dwavesystems/dwave-system/issues/363) via a `DWAVE_FEATURE_FLAGS` env var
* Add `LeapHybridBQMSampler` alias for `LeapHybridSampler` to the `dwave.system` namespace

New Features
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- Suggest using the EmbeddingComposite when the hardware graph is incompatible (https://github.com/dwavesystems/dwave-system/pull/424)
- Support dwave-cloud-client 0.9.x

New Features
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- Scale the problem submitted to `DWaveCliqueSampler` to avoid `per_qubit_coupling_range` violations. https://github.com/dwavesystems/dwave-system/pull/417

Fixes
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- Properly account for DQMs with offsets in LeapHybridDQMSampler. https://github.com/dwavesystems/dwave-system/pull/415
- Fix support for dimod 0.9. https://github.com/dwavesystems/dwave-system/pull/421
- Use soft defaults-level solver filtering in Leap hybrid samplers, fixing https://github.com/dwavesystems/dwave-system/issues/363. Solver for hybrid samplers can now be defined via a config file and environment variable, not just via argument to the sampler.
- Fix tests not to depend on QPU topology availability. https://github.com/dwavesystems/dwave-system/pull/423

New Features
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* Support `CaseLabelDQM` https://github.com/dwavesystems/dwave-system/pull/409
* Support dimod 0.10.x

Fixes
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- Updated sphinx and docs conf (400)
- Documented samplers async behavior (408)
- Added more properties to `MockDWaveSampler` (403)
- CI refactored; leaner integration tests (405)

Changes
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- Dropped Python 3.5 support (405)