Glueviz

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* Fixed treatment of newlines when copying detailed error. [687]

* Fix a bug that prevented sessions from being saved with embedded files if
component units were Astropy units. [686]

* Users should now press 'control' to drag rather than re-define subsets. [689]

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- Fixed a bug that caused alpha scaling to not work correctly when mapping
scatter marker colors to an attribute. [201]

- Watch for ``NumericalDataChangedMessage`` messages. [183, 184]

- Fixed a bug that caused color-coding and size-scaling of points in 3D viewer
to not work for negative values. [182, 185]

- Add support for overplotting scatter markers on top of volumes. [200]

- Add support for n-dimensional components in 3D scatter plot viewer. [158]

- Factor of ~10 improvement in performance when selecting data in the scatter
or volume viewers. [165]

- Make selection frame wider. [161]

- Small fix of the camera initial settings & rotate speed . [154]

- Advanced point-mode selection for scatter points. [160]

- Experimental point-mode selection for volume viewer. [159]

- Fix button to record animations when the user cancels the file save dialog.
[186]

- Fix Qt imports to use QtPy for new versions of glue. [173, 178, 186]

- Add an option to clip any data outside the specified limits. [203]

- Add a checkbox to force the aspect ratio to be native instead of
making all axes the same length. [205]

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- Bundle the latest developer version of VisPy. [143, 144]

- Add a checkbox to toggle between near and far-field view. [140]

- Support the options in Glue v0.8 for foreground and background colors in viewers. [149]

- Fix a bug that caused subsets selected in the 3D viewers to be applied to
datasets for which they aren't relevant. [151]

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- Add selection toolbar and icons for 3D viewers. [88, 92]

- Workaround OpenGL issue that caused cubes with size > 2048 along any
dimension to not display. [100]

- Implemented 3D selection. [103]

- Fix issue with _update_data on base VisPy viewer. [106]

- Make sure an error is raised if data is not 3-dimensional and shape doesn’t
agree with existing data in volume viewer. [112]

- Fix a bug that caused exceptions when clearing/removing layer artists. [117]

- Optimize the layout of options for the layer style editors to save space. [120]

- Added the ability to save static images of the 3D viewers. [125]

- Add toolbar icon to continuously rotate the view. [128][137]

- Raise an explicit error if PyOpenGL is not installed. [129]

- Implement support for saving 3D viewers in session files. [130]

- Fix bug that caused all layers in the 3D scatter viewer to disappear when
one layer was removed. [131]

- Make sure the 3D viewer is updated if the zorder is set manually. [132]

- Added ``BACKGROUND_COLOR`` and ``FOREGROUND_COLOR`` settings at root of package. [134]

- Make sure combo boxes don't expand if component names are long. [135]

- Travis: add back testing against stable glue [136]

- Save animation with imageio. [139]

- Add toggle for perspective view. [140]

- Bundle latest developer version of Vispy. [143] [144]

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- Significant work has gone into making the scatter and volume viewers
functional. Subsets can be highlighted in either viewer.

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- Initial release, includes simple volume viewer.