Qwt 6.3.0
=========

- QwtPainter

	polyline splitting reenabled

- QwtPicker

	QwtPicker::trackerRect added

- QwtPlotCurve

	QwtPlotCurve::adjacentPoint added
	QwtPlotCurve::interpolatedValueAt added

- QwtPlotOpenGLCanvas

    passing the samples instead of a QSurfaceFormat

- QwtSeriesData

	wrong inheritances fixed

- QwtPlotIntervalCurve

	QwtPlotIntervalCurve::TubeAsLines mode

- QwtSeriesData

	firstSample, lastSample added
