Pynbody

Bug fixes
- Fixed RGB star rendering on Python 3
- Fixed bugs affecting isolated runs with Gadget

Enhancements
- Better handling of how "eps" (softening) is passed to gravity routines to avoid dtype mismatches
- Introduced option to use a .units file to override the default inferred units of a file (Michele Mastropietro)
- Made improved error message for when a multi-threaded image rendering goes wrong on one or more threads

New features
- NFW profile fitting, with a framework for fitting other generic profiles (by Martin Rey)
- Halo shape fitting (by Matt Orkney)

* Reads Rockstar catalogues
* Refactors halo module into a subpackage for better readability and maintainability
* Improved GadgetHDF versatility

Adds support for new Ramses format, and fix bugs with HOP catalogue implementation

Bug-fix release addresses inappropriate default colour scaling in `pynbody.plot.sph.image` and related functions.

Plotting enhancements
- Adds an ability to use vector fields other than `vel` in `plot.sph.velocity_image`
- Vector fields are now correctly depth-averaged in `plot.sph.velocity_image` if the main image is depth-averaged or integrated
- A mag/arcsec^2 range can now be specified to `plot.stars.render`

Bug fixes and miscellaneous enhancements
- Now loads RAMSES-RT radiation information
- Resolves an issue where a fraction of ramses cells at `levelmax` could go missing
- SubFind is now supported
- Removes the warning about logging which is now 2 years old
- Resolves a datatype issue when loading gadget files written by L-PICOLA and related codes
- Fixes an issue with `plot.sph.image` where `vmin` was not respected when negative values were present and log scaling selected
- Increases speed of loading large gadget files
- Resolves issues with numpy 1.10.x
- Fixes an issue with dimensionless arrays raising errors during unit conversions
- Added a new `fuzzy_match_catalog` to the `bridge` module, allowing identifications for halos to return confidence levels and alternative matches
- Fixes error loading AHF catalogs in python 3
- Documentation can now be built with python 3