Qt5 built in qwt (#570)

- qt4->qt5
- in built qt5 6.1.5 because rhel7 is not upto date with qt5, removed findqwt.cmake
- made a fix in qwt lib (qwt_plot_layout.h) to work with 5.15 and lower versions for qrect constr.
- qt5 forms fixed, qt4 many hard coding forms switched to forms including qtabwidget, scrolls etc, fonts moved to forms
 - docking option enabled by default, removed option to disable docking feature from "Mode"
- added qVersionResolve utility functions to handle compatibility before and after qt5.12
- qtplots (ian's code) takes in gain mode enable to set some settings within the class, with proper gain plot ticks
- ensure gain plots have no zooming of z axis in 2d and y axis in 1d
- removed placeholder text in qpalette in main window form as its not supportd until 5.12 (so using qt5.9 designer insted of qt5.15 to cope)
- tab order
Servers:
- fixed some error messages that were empty for fail in funcs (mostly minor as if this error, major issues)

libs/qwt-6.1.5/include/qwt_point_data.h

@@ -0,0 +1,146 @@
+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QWT_POINT_DATA_H
+#define QWT_POINT_DATA_H 1
+
+#include "qwt_global.h"
+#include "qwt_series_data.h"
+
+/*!
+  \brief Interface for iterating over two QVector<double> objects.
+*/
+class QWT_EXPORT QwtPointArrayData: public QwtSeriesData<QPointF>
+{
+public:
+    QwtPointArrayData( const QVector<double> &x, const QVector<double> &y );
+    QwtPointArrayData( const double *x, const double *y, size_t size );
+
+    virtual QRectF boundingRect() const;
+
+    virtual size_t size() const;
+    virtual QPointF sample( size_t index ) const;
+
+    const QVector<double> &xData() const;
+    const QVector<double> &yData() const;
+
+private:
+    QVector<double> d_x;
+    QVector<double> d_y;
+};
+
+/*!
+  \brief Data class containing two pointers to memory blocks of doubles.
+ */
+class QWT_EXPORT QwtCPointerData: public QwtSeriesData<QPointF>
+{
+public:
+    QwtCPointerData( const double *x, const double *y, size_t size );
+
+    virtual QRectF boundingRect() const;
+    virtual size_t size() const;
+    virtual QPointF sample( size_t index ) const;
+
+    const double *xData() const;
+    const double *yData() const;
+
+private:
+    const double *d_x;
+    const double *d_y;
+    size_t d_size;
+};
+
+/*!
+  \brief Synthetic point data
+
+  QwtSyntheticPointData provides a fixed number of points for an interval.
+  The points are calculated in equidistant steps in x-direction.
+
+  If the interval is invalid, the points are calculated for
+  the "rectangle of interest", what normally is the displayed area on the
+  plot canvas. In this mode you get different levels of detail, when
+  zooming in/out.
+
+  \par Example
+
+  The following example shows how to implement a sinus curve.
+
+  \code
+#include <cmath>
+#include <qwt_series_data.h>
+#include <qwt_plot_curve.h>
+#include <qwt_plot.h>
+#include <qapplication.h>
+
+class SinusData: public QwtSyntheticPointData
+{
+public:
+    SinusData():
+        QwtSyntheticPointData( 100 )
+    {
+    }
+
+    virtual double y( double x ) const
+    {
+        return qSin( x );
+    }
+};
+
+int main(int argc, char **argv)
+{
+    QApplication a( argc, argv );
+
+    QwtPlot plot;
+    plot.setAxisScale( QwtPlot::xBottom, 0.0, 10.0 );
+    plot.setAxisScale( QwtPlot::yLeft, -1.0, 1.0 );
+
+    QwtPlotCurve *curve = new QwtPlotCurve( "y = sin(x)" );
+    curve->setData( new SinusData() );
+    curve->attach( &plot );
+
+    plot.show();
+    return a.exec();
+}
+   \endcode
+*/
+class QWT_EXPORT QwtSyntheticPointData: public QwtSeriesData<QPointF>
+{
+public:
+    QwtSyntheticPointData( size_t size,
+        const QwtInterval & = QwtInterval() );
+
+    void setSize( size_t size );
+    virtual size_t size() const;
+
+    void setInterval( const QwtInterval& );
+    QwtInterval interval() const;
+
+    virtual QRectF boundingRect() const;
+    virtual QPointF sample( size_t index ) const;
+
+    /*!
+       Calculate a y value for a x value
+
+       \param x x value
+       \return Corresponding y value
+     */
+    virtual double y( double x ) const = 0;
+    virtual double x( uint index ) const;
+
+    virtual void setRectOfInterest( const QRectF & );
+    QRectF rectOfInterest() const;
+
+private:
+    size_t d_size;
+    QwtInterval d_interval;
+    QRectF d_rectOfInterest;
+    QwtInterval d_intervalOfInterest;
+};
+
+#endif