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_abstract_barchart.h

@@ -0,0 +1,97 @@
+/* -*- 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_ABSTRACT_BAR_CHART_H
+#define QWT_PLOT_ABSTRACT_BAR_CHART_H
+
+#include "qwt_global.h"
+#include "qwt_plot_seriesitem.h"
+#include "qwt_series_data.h"
+
+/*!
+  \brief Abstract base class for bar chart items
+
+  In opposite to almost all other plot items bar charts can't be
+  displayed inside of their bounding rectangle and need a special
+  API  how to calculate the width of the bars and how they affect
+  the layout of the attached plot.
+ */
+class QWT_EXPORT QwtPlotAbstractBarChart: public QwtPlotSeriesItem
+{
+public:
+    /*!
+        \brief Mode how to calculate the bar width
+
+        setLayoutPolicy(), setLayoutHint(), barWidthHint()
+     */
+    enum LayoutPolicy
+    {
+        /*!
+          The sample width is calculated by dividing the bounding rectangle
+          by the number of samples. The layoutHint() is used as a minimum width
+          in paint device coordinates.
+
+          \sa boundingRectangle()
+         */
+        AutoAdjustSamples,
+
+        /*!
+          layoutHint() defines an interval in axis coordinates
+         */
+        ScaleSamplesToAxes,
+
+        /*!
+          The bar width is calculated by multiplying layoutHint()
+          with the height or width of the canvas.
+
+          \sa boundingRectangle()
+         */
+        ScaleSampleToCanvas,
+
+        /*!
+          layoutHint() defines a fixed width in paint device coordinates.
+         */
+        FixedSampleSize
+    };
+
+    explicit QwtPlotAbstractBarChart( const QwtText &title );
+    virtual ~QwtPlotAbstractBarChart();
+
+    void setLayoutPolicy( LayoutPolicy );
+    LayoutPolicy layoutPolicy() const;
+
+    void setLayoutHint( double );
+    double layoutHint() const;
+
+    void setSpacing( int );
+    int spacing() const;
+
+    void setMargin( int );
+    int margin() const;
+
+    void setBaseline( double );
+    double baseline() const;
+
+    virtual void getCanvasMarginHint(
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect,
+        double &left, double &top, double &right, double &bottom) const;
+
+
+protected:
+    double sampleWidth( const QwtScaleMap &map,
+        double canvasSize, double boundingSize,
+        double value ) const;
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif