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_plot_barchart.h

@@ -0,0 +1,118 @@
+/* -*- 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_PLOT_BAR_CHART_H
+#define QWT_PLOT_BAR_CHART_H
+
+#include "qwt_global.h"
+#include "qwt_plot_abstract_barchart.h"
+#include "qwt_series_data.h"
+
+class QwtColumnRect;
+class QwtColumnSymbol;
+
+/*!
+  \brief QwtPlotBarChart displays a series of a values as bars.
+
+  Each bar might be customized individually by implementing
+  a specialSymbol(). Otherwise it is rendered using a default symbol.
+
+  Depending on its orientation() the bars are displayed horizontally
+  or vertically. The bars cover the interval between the baseline()
+  and the value.
+
+  By activating the LegendBarTitles mode each sample will have
+  its own entry on the legend.
+
+  The most common use case of a bar chart is to display a
+  list of y coordinates, where the x coordinate is simply the index
+  in the list. But for other situations ( f.e. when values are related
+  to dates ) it is also possible to set x coordinates explicitly.
+
+  \sa QwtPlotMultiBarChart, QwtPlotHistogram, QwtPlotCurve::Sticks,
+      QwtPlotSeriesItem::orientation(), QwtPlotAbstractBarChart::baseline()
+ */
+class QWT_EXPORT QwtPlotBarChart:
+    public QwtPlotAbstractBarChart, public QwtSeriesStore<QPointF>
+{
+public:
+    /*!
+      \brief Legend modes.
+
+      The default setting is QwtPlotBarChart::LegendChartTitle.
+      \sa setLegendMode(), legendMode()
+    */
+    enum LegendMode
+    {
+        /*!
+          One entry on the legend showing the default symbol
+          and the title() of the chart
+
+          \sa QwtPlotItem::title()
+         */
+        LegendChartTitle,
+
+        /*!
+          One entry for each value showing the individual symbol
+          of the corresponding bar and the bar title.
+
+          \sa specialSymbol(), barTitle()
+         */
+        LegendBarTitles
+    };
+
+    explicit QwtPlotBarChart( const QString &title = QString() );
+    explicit QwtPlotBarChart( const QwtText &title );
+
+    virtual ~QwtPlotBarChart();
+
+    virtual int rtti() const;
+
+    void setSamples( const QVector<QPointF> & );
+    void setSamples( const QVector<double> & );
+    void setSamples( QwtSeriesData<QPointF> * );
+
+    void setSymbol( QwtColumnSymbol * );
+    const QwtColumnSymbol *symbol() const;
+
+    void setLegendMode( LegendMode );
+    LegendMode legendMode() const;
+
+    virtual void drawSeries( QPainter *painter,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect, int from, int to ) const;
+
+    virtual QRectF boundingRect() const;
+
+    virtual QwtColumnSymbol *specialSymbol(
+        int sampleIndex, const QPointF& ) const;
+
+    virtual QwtText barTitle( int sampleIndex ) const;
+
+protected:
+    virtual void drawSample( QPainter *painter,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect, const QwtInterval &boundingInterval,
+        int index, const QPointF& sample ) const;
+
+    virtual void drawBar( QPainter *,
+        int sampleIndex, const QPointF& sample,
+        const QwtColumnRect & ) const;
+
+    QList<QwtLegendData> legendData() const;
+    QwtGraphic legendIcon( int index, const QSizeF & ) const;
+
+private:
+    void init();
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif