Dials

* dials.image_viewer: fix crash on Windows
* dials.image_viewer: fix crash when using masks (cctbx/cctbx_project107)
* dials.stills_process: fix out of memory error when processing large files
* xia2: pipeline=2d support for Rigaku RAXIS detectors (xia2/xia2200)

* dials: Fix indexing for small molecule data with unit cell <100A^3.
* dials: Improve Eiger file support
* dials: Smargon support for data from DLS I03
* xia2: Fix indexing method fallback

* dials: fix build issue on macOS 10.13 (High Sierra), 77
* dials: fix run issues on macOS <10.12
* dials: fix DLS I23 image interpretation
* xia2: Fix ImportError bug on Windows (xia2/xia2194)
* xia2 / XDS: Fix 'pixel value' issue with recent XDS versions (xia2/xia2193)
* xia2 / XDS: Refine detector position in second integration round (xia2/xia2181)

* Added option dials.show show_flags=true, for more information about how reflections were classified
* dials.refine: new diagnostic for problematic refinement cases, using the condition number of the Jacobian
* dials.refine: increase default max_iterations for problematic refinement cases
* dials.refine: bug fix for setting smoother parameters for scan-varying refinement
* dials: spot_counts_per_image fixes

* fix HDF5 library download location
* support for Smargon goniometer on Soleil PROXIMA-1
* xia2: fix issue with XDS trusted ranges (xia2/xia2182)
* xia2: allow processing of images with .gz extension (xia2/xia2184)

* dev.dials.csv: clean up command line help
* xia2 ISPyB interface: use files in DataFiles directory in preference to other locations.
* pytest 3 compatibility fix