nipy/nibabel: 2.3.0

New feature release for the 2.3 series. Most work on NiBabel so far has been by Matthew Brett (MB), Michael Hanke (MH) Ben Cipollini (BC), Marc-Alexandre Côté (MC), Chris Markiewicz (CM), Stephan Gerhard (SG) and Eric Larson (EL). References like "pr/298" refer to github pull request numbers. New features TRK TCK streamlines conversion CLI tools (pr/606) (MC, reviewed by CM) Image slicing for SpatialImages (pr/550) (CM) Enhancements Simplfiy MGHImage and add footer fields (pr/569) (CM, reviewed by MB) Force sform/qform codes to be ints, rather than numpy types (pr/575) (Paul McCarthy, reviewed by MB, CM) Auto-fill color table in FreeSurfer annotation file (pr/592) (Paul McCarthy, reviewed by CM, MB) Set default intent code for CIFTI2 images (pr/604) (Mathias Goncalves, reviewed by CM, Satra Ghosh, MB, Tim Coalson) Raise informative error on empty files (pr/611) (Pradeep Raamana, reviewed by CM, MB) Accept degenerate filenames such as .nii (pr/621) (Dimitri Papadopoulos-Orfanos, reviewed by Yaroslav Halchenko) Take advantage of IndexedGzipFile drop_handles flag to release filehandles by default (pr/614) (Paul McCarthy, reviewed by CM, MB) Bug fixes Preserve first point of LazyTractogram (pr/588) (MC, reviewed by Nil Goyette, CM, MB) Stop adding extraneous metadata padding (pr/593) (Jon Stutters, reviewed by CM, MB) Accept lower-case orientation codes in TRK files (pr/600) (Kesshi Jordan, MB, reviewed by MB, MC, CM) Annotation file reading (pr/592) (Paul McCarthy, reviewed by CM, MB) Fix buffer size calculation in ArraySequence (pr/597) (Serge Koudoro, reviewed by MC, MB, Eleftherios Garyfallidis, CM) Resolve UnboundLocalError in Python 3 (pr/607) (Jakub Kaczmarzyk, reviewed by MB, CM) Do not crash on non-ImportError failures in optional imports (pr/618) (Yaroslav Halchenko, reviewed by CM) Return original array from get_fdata for array image, if no cast required (pr/638, MB, reviewed by CM) Maintenance Use SSH address to use key-based auth (pr/587) (CM, reviewed by MB) Fix doctests for numpy 1.14 array printing (pr/591) (MB, reviewed by CM) Refactor for pydicom 1.0 API changes (pr/599) (MB, reviewed by CM) Increase test coverage, remove unreachable code (pr/602) (CM, reviewed by Yaroslav Halchenko, MB) Move nib-ls and other programs to a new cmdline module (pr/601, pr/615) (Chris Cheng, reviewed by MB, Yaroslav Halchenko) Remove deprecated numpy indexing (EL, reviewed by CM) Update documentation to encourage get_fdata over get_data (pr/637, MB, reviewed by CM) API changes and deprecations Support for keep_file_open = 'auto' as a parameter to Opener() will be deprecated in 2.4, for removal in 3.0. Accordingly, support for openers.KEEP_FILE_OPEN_DEFAULT = 'auto' will be dropped on the same schedule. Drop-in support for indexed_gzip < 0.7 has been removed