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_transform.h

@@ -0,0 +1,142 @@
+/* -*- 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_TRANSFORM_H
+#define QWT_TRANSFORM_H
+
+#include "qwt_global.h"
+
+/*!
+   \brief A transformation between coordinate systems
+
+   QwtTransform manipulates values, when being mapped between
+   the scale and the paint device coordinate system.
+
+   A transformation consists of 2 methods:
+
+   - transform
+   - invTransform
+
+   where one is is the inverse function of the other.
+
+   When p1, p2 are the boundaries of the paint device coordinates
+   and s1, s2 the boundaries of the scale, QwtScaleMap uses the
+   following calculations:
+
+   - p = p1 + ( p2 - p1 ) * ( T( s ) - T( s1 ) / ( T( s2 ) - T( s1 ) );
+   - s = invT ( T( s1 ) + ( T( s2 ) - T( s1 ) ) * ( p - p1 ) / ( p2 - p1 ) );
+*/
+class QWT_EXPORT QwtTransform
+{
+public:
+    QwtTransform();
+    virtual ~QwtTransform();
+
+    /*!
+       Modify value to be a valid value for the transformation.
+       The default implementation does nothing.
+     */
+    virtual double bounded( double value ) const;
+
+    /*!
+        Transformation function
+
+        \param value Value
+        \return Modified value
+
+        \sa invTransform()
+     */
+    virtual double transform( double value ) const = 0;
+
+    /*!
+        Inverse transformation function
+
+        \param value Value
+        \return Modified value
+
+        \sa transform()
+     */
+    virtual double invTransform( double value ) const = 0;
+
+    //! Virtualized copy operation
+    virtual QwtTransform *copy() const = 0;
+};
+
+/*!
+   \brief Null transformation
+
+   QwtNullTransform returns the values unmodified.
+
+ */
+class QWT_EXPORT QwtNullTransform: public QwtTransform
+{
+public:
+    QwtNullTransform();
+    virtual ~QwtNullTransform();
+
+    virtual double transform( double value ) const;
+    virtual double invTransform( double value ) const;
+
+    virtual QwtTransform *copy() const;
+};
+/*!
+   \brief Logarithmic transformation
+
+   QwtLogTransform modifies the values using log() and exp().
+
+   \note In the calculations of QwtScaleMap the base of the log function
+         has no effect on the mapping. So QwtLogTransform can be used
+         for log2(), log10() or any other logarithmic scale.
+ */
+class QWT_EXPORT QwtLogTransform: public QwtTransform
+{
+public:
+    QwtLogTransform();
+    virtual ~QwtLogTransform();
+
+    virtual double transform( double value ) const;
+    virtual double invTransform( double value ) const;
+
+    virtual double bounded( double value ) const;
+
+    virtual QwtTransform *copy() const;
+
+#if QT_VERSION >= 0x050400
+    static const double LogMin;
+    static const double LogMax;
+#else
+    QT_STATIC_CONST double LogMin;
+    QT_STATIC_CONST double LogMax;
+#endif
+};
+
+/*!
+   \brief A transformation using pow()
+
+   QwtPowerTransform preserves the sign of a value.
+   F.e. a transformation with a factor of 2
+   transforms a value of -3 to -9 and v.v. Thus QwtPowerTransform
+   can be used for scales including negative values.
+ */
+class QWT_EXPORT QwtPowerTransform: public QwtTransform
+{
+public:
+    QwtPowerTransform( double exponent );
+    virtual ~QwtPowerTransform();
+
+    virtual double transform( double value ) const;
+    virtual double invTransform( double value ) const;
+
+    virtual QwtTransform *copy() const;
+
+private:
+    const double d_exponent;
+};
+
+#endif