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_seriesitem.h

@@ -0,0 +1,66 @@
+/* -*- 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_SERIES_ITEM_H
+#define QWT_PLOT_SERIES_ITEM_H
+
+#include "qwt_global.h"
+#include "qwt_plot_item.h"
+#include "qwt_scale_div.h"
+#include "qwt_series_data.h"
+#include "qwt_series_store.h"
+
+/*!
+  \brief Base class for plot items representing a series of samples
+*/
+class QWT_EXPORT QwtPlotSeriesItem: public QwtPlotItem,
+    public virtual QwtAbstractSeriesStore
+{
+public:
+    explicit QwtPlotSeriesItem( const QString &title = QString() );
+    explicit QwtPlotSeriesItem( const QwtText &title );
+
+    virtual ~QwtPlotSeriesItem();
+
+    void setOrientation( Qt::Orientation );
+    Qt::Orientation orientation() const;
+
+    virtual void draw( QPainter *,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF & ) const;
+
+    /*!
+      Draw a subset of the samples
+
+      \param painter Painter
+      \param xMap Maps x-values into pixel coordinates.
+      \param yMap Maps y-values into pixel coordinates.
+      \param canvasRect Contents rectangle of the canvas
+      \param from Index of the first point to be painted
+      \param to Index of the last point to be painted. If to < 0 the
+             curve will be painted to its last point.
+    */
+    virtual void drawSeries( QPainter *painter,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect, int from, int to ) const = 0;
+
+    virtual QRectF boundingRect() const;
+
+    virtual void updateScaleDiv(
+        const QwtScaleDiv &, const QwtScaleDiv & );
+
+protected:
+    virtual void dataChanged();
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif