/*!
\page qwtchangelog What's new in Qwt 6.2

\tableofcontents

\section PLATFORM Qt >= 4.8

Support for Qt < Qt 4.8 has been dropped, support for Qt6 has been added.

\section Class Includes

Include files, that match the class names are available now. So
it is possible to write "#include <QwtPlot>" now instead of "include qwt_plot.h"

\section POLAR QwtPolar has become part of Qwt

The QwtPolar project ( https://qwtpolar.sourceforge.io ) has been integrated
into Qwt. 

\section MATHML MathML Text Renderer has become its own project

The code can be found at https://github.com/uwerat/qwt-mml-dev now and is intended
to become a standalone lib.

\section SPLINES Spline

The broken implementation of QwtSpline has been replaced by a bunch of classes
offering all sort of functionalities around splines.

The most popular spline approximation/interpolation algos have been implemented:

    - Basis
    - Cardinal
    - ParabolicBlending
    - Akima
    - The one used in a proprietory office package
    - Cubic

\section OPENGL Better OpenGL support

QwtPlotOpenGLCanvas added to support rendering to a QOpenGLWidget

\section ITEMS New plot items

    - QwtPlotVectorField
      A new type of plot item for vector fields

    - QwtPlotGraphicItem
      An item displaying a QwtGraphic image ( f.e used by QwtPlotSvgItem )

\section CURVE QwtPlotCurve

	- QwtPlotCurve::FilterPointsAggressive
      A fast weeding algo for huge datasets with increasing x or y values

	- QwtPlotCurve::closestPoint
	  Is virtual now

	- Line Clipping
	  Includes the painter clip now

	- QwtValuePointData
	  A new type of data added, where the x values are the index

	- QwtPlotCurve::setSamples
	  more type of setters

\section SPECTROGRAM QwtPlotSpectrogram

	- QwtPlotSpectrogram::setColorTableSize
      Using individual RGB tables

	- QwtRasterData::setInterval/interval
	  API cleanup

	- QwtHueColorMap, QwtSaturationValueColorMap
	  New type of color maps

	- QwtMatrixRasterData::BicubicInterpolation
	  Implementation of bicubic interpolation added

	- Handling of NaN values
      NaN values are interpreted as gaps, when QwtRasterData::WithoutGaps
      is not set

\section OTHERS Other changes

    - QwtPlotRenderer
      Using QPdfWriter instead of QPrinter, where possible

	- Handling of Unknown Paint Engines
      Not aligning unknown paint engines ( f.e EMF ), QwtNullPaintDevice is not using
      QPaintEngine::User anymore

	- QwtTransform::LogMin/LogMax
	  LOG_MIN/LOG_MAX have been reomed ( values differ ! 

	- qwt_compat.h
	  Removed

	- qwtFuzzyGreaterOrEqual/qwtFuzzyLessOrEqual
	  Removed

	- qwtGetMin/qwtGetMax
	  Removed
 */