New features and performance enhancements

Some salient updates

1. HEDM indexer can now handle discontinuities in ω range ("broken scans")
2. Robustness added to powder line fitting via lmfit models with constraints
3. Various bug fixes and platform-specific stablility fixes.

What's Changed

• Bump numpy version by @psavery in #397
• Fix multiprocessing context for ProcessPoolExecutor by @joelvbernier in #398
• Check shape of hkl array before write by @saransh13 in #400
• add tqdm package dependency by @joelvbernier in #401
• Fitting fixes jvb by @joelvbernier in #389
• Use logger for InstrumentCalibrator by @psavery in #402
• fix atomic weight of berkelium (Bk) by @saransh13 in #405
• catch None in hdf5 write as TypeError by @joelvbernier in #403
• Powder line extraction by @joelvbernier in #407
• Catch for flat patch data by @joelvbernier in #406
• Update nfutil.py by @darrencpagan in #408
• Update nfutil.py by @darrencpagan in #409
• Downgrade windows CI to windows-2019 by @psavery in #412
• Fix spot export error for multiple grains by @psavery in #429
• Set default dmin to None in load_materials_hdf5() by @psavery in #428
• Update rotations.py by @joelvbernier in #433
• Add a gaussian laplace op to ProcessedImageSeries by @psavery in #430
• attribute for picks and logging by @joelvbernier in #404

Full Changelog: 0.8.18...0.8.19