- Renamed GraphicsView signals to avoid collision with ViewBox signals that
are wrapped in PlotWidget: sigRangeChanged => sigDeviceRangeChanged and
sigTransformChanged => sigDeviceTransformChanged.
- All signal disconnections that catch TypeError now also catch RuntimeError
for pyside compatibility.
- isosurface works for arrays with shapes > 255
- Fixed ImageItem exception building histogram when image has only one value
- Fixed MeshData exception caused when vertexes have no matching faces
- Fixed GLViewWidget exception handler
ImageItem.getHistogram is more clever about constructing histograms:
- integer dtype images now have integer-aligned bins, with bin number
determined by a target value
- step size is automatically chosen based on a target image size
- bins and step arguments have default values 'auto'
