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_scale_div.h

@@ -0,0 +1,110 @@
+/* -*- 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_SCALE_DIV_H
+#define QWT_SCALE_DIV_H
+
+#include "qwt_global.h"
+#include "qwt_interval.h"
+#include <qlist.h>
+
+#ifndef QT_NO_DEBUG_STREAM
+#include <qdebug.h>
+#endif
+
+/*!
+  \brief A class representing a scale division
+
+  A Qwt scale is defined by its boundaries and 3 list
+  for the positions of the major, medium and minor ticks.
+
+  The upperBound() might be smaller than the lowerBound()
+  to indicate inverted scales.
+
+  Scale divisions can be calculated from a QwtScaleEngine.
+
+  \sa QwtScaleEngine::divideScale(), QwtPlot::setAxisScaleDiv(),
+      QwtAbstractSlider::setScaleDiv()
+*/
+
+class QWT_EXPORT QwtScaleDiv
+{
+public:
+    //! Scale tick types
+    enum TickType
+    {
+        //! No ticks
+        NoTick = -1,
+
+        //! Minor ticks
+        MinorTick,
+
+        //! Medium ticks
+        MediumTick,
+
+        //! Major ticks
+        MajorTick,
+
+        //! Number of valid tick types
+        NTickTypes
+    };
+
+    explicit QwtScaleDiv( double lowerBound = 0.0,
+        double upperBound = 0.0 );
+
+    explicit QwtScaleDiv( const QwtInterval &, QList<double>[NTickTypes] );
+
+    explicit QwtScaleDiv( double lowerBound, double upperBound,
+        QList<double>[NTickTypes] );
+
+    explicit QwtScaleDiv( double lowerBound, double upperBound,
+        const QList<double> &minorTicks, const QList<double> &mediumTicks,
+        const QList<double> &majorTicks );
+
+    bool operator==( const QwtScaleDiv & ) const;
+    bool operator!=( const QwtScaleDiv & ) const;
+
+    void setInterval( double lowerBound, double upperBound );
+    void setInterval( const QwtInterval & );
+    QwtInterval interval() const;
+
+    void setLowerBound( double );
+    double lowerBound() const;
+
+    void setUpperBound( double );
+    double upperBound() const;
+
+    double range() const;
+
+    bool contains( double value ) const;
+
+    void setTicks( int tickType, const QList<double> & );
+    QList<double> ticks( int tickType ) const;
+
+    bool isEmpty() const;
+    bool isIncreasing() const;
+
+    void invert();
+    QwtScaleDiv inverted() const;
+
+    QwtScaleDiv bounded( double lowerBound, double upperBound ) const;
+
+private:
+    double d_lowerBound;
+    double d_upperBound;
+    QList<double> d_ticks[NTickTypes];
+};
+
+Q_DECLARE_TYPEINFO( QwtScaleDiv, Q_MOVABLE_TYPE );
+
+#ifndef QT_NO_DEBUG_STREAM
+QWT_EXPORT QDebug operator<<( QDebug, const QwtScaleDiv & );
+#endif
+
+#endif