Nengo-gui

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- Improvement: subclasses of Network use their class name as a default label
- Bugfix: Removed duplicate response headers (fixes loading in Chrome)
- Bugfix: Fix for running with Tornado 6
- Bugfix: Handle recent changes to nengo.Process API (backwards-compatible)

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- API change: Added backend to InlineGUI constructor.
- Improvement (Experimental): Added simulator hooks
- Improvement: Added audible spike sounds
- Improvement (Experimental): Nodes have access to the GUI keyboard state
- Improvement: support for nengo-bio Connections
- Improvement: show multiple connections between objects
- Bugfix: handle new Connection transform in Nengo 3.0.0
- Bugfix: escape labels so they aren't treated as HTML
- Improvement: reworked networking to allow clean integration with Jupyter

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- Bugfix: thread-safety for jedi autocompletion
- Bugfix: Handle authentication when connecting to multiple servers
- Bugfix: Fail gracefully when binding server

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- Bugfix: Cloud plots for nengo_spa.Transcode plots no longer fail

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- Bugfix: File menu no longer has an incorrect height
- Bugfix: SPA plots for nengo_spa are now created correctly

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- Added build progress indicator
- Added status bar
- Pan view with CTRL/MMB
- Support for nengo_spa
- Added --browser option
- Added --unsecure option
- Fixed backspace not working on sliders, search box
- Added autocomplete to text editor
- Added visual depiction of modulatory and inhibitory connections
- Token-based authentication
- Dual-stack IPv4/IPv6 support