Fixed GLScatterPlotItem to allow opaque spots
CSVExporter: fix the case when stepMode=True
Added InfiniteLine.setHoverPen
Docstring updates for ParameterTree
Added some ViewBox unit tests, fixed minor API bug
Fixed ViewBox error when accessing zoom history before having zoomed.
Fixed CSV export when PlotDataItem uses stepMode=True
Added CSV export unit tests
Merge remote-tracking branch 'termim/csv' into develop
Added missing .ui file needed for uic unit test
Minor fix in list parameter
Added new demos:
- Relativity simulator
- Optics simulator
- Mechanical chain simulator
Python 3 fixes for new demos
Added dialog to hdf5 example prompting user to generate sample data
Removed unnecessary file allocation from functions.interpolateArray
Added cx_freeze example (thanks Jerry!)
Added scrolling plot examples
Added image analysis example
Fixed relativity example
Update CONTRIB with instructions on checking style
BarGraphItem: add setPen and setBrush methods
BarGraphItem: factor out setData()