PlotItem.showValues fixed (was not implemented before).
Fixes calculation of axis width/height in case values are not shown.
Merge branch 'showValues_fix' of https://github.com/JNevrly/pyqtgraph into JNevrly-showValues_fix
Style changes and a minor bug fix
Fixed AxisItem.__init__(showValues=False)
Merge branch 'JNevrly-showValues_fix' into develop
py3 fix for parametertree example