minor docstring updates
Fixed TableWidget append / sort issues
cleanup
Fix TableWidget sorting behavior when appending and editing data

Merge branch 'tablewidget_fix' into develop
Added configurable formatting for TableWidget
PlotDataItem: add missing 'stepMode' keyword argument for PlotCurveItem
Add support for formatting TableWidget items
Merge branch 'tablewidget_formatting' into develop
Fixed AxisItem not resizing text area when setTicks() is used
minor cleanup
Added 'stepMode' argument to PlotDataItem()

Merge branch 'plotdataitem_stepmode' into develop
BarGraphItem: add setPen and setBrush methods
BarGraphItem: factor out setData()
BarGraphItem: implement dataBounds method