Antimony 0.7.1
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Features:
- Added `title` property (that can be set by Script node).
- Display `stdout`, errors in separate panes when editing script.
- Improved icon.
- Added polar iteration node, which rotates input about a point multiple times.
- Wrote basic usage guide

Bug fixes:
- When a node is deleted from a 3D view, undo/redo now re-creates connections
