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/doc/man/man3/QwtCPointerData.3

@@ -0,0 +1,129 @@
+.TH "QwtCPointerData" 3 "Mon Jun 1 2020" "Version 6.1.5" "Qwt User's Guide" \" -*- nroff -*-
+.ad l
+.nh
+.SH NAME
+QwtCPointerData \- Data class containing two pointers to memory blocks of doubles\&.  
+
+.SH SYNOPSIS
+.br
+.PP
+.PP
+\fC#include <qwt_point_data\&.h>\fP
+.PP
+Inherits \fBQwtSeriesData< QPointF >\fP\&.
+.SS "Public Member Functions"
+
+.in +1c
+.ti -1c
+.RI "\fBQwtCPointerData\fP (const double *x, const double *y, size_t \fBsize\fP)"
+.br
+.ti -1c
+.RI "virtual QRectF \fBboundingRect\fP () const"
+.br
+.RI "Calculate the bounding rectangle\&. "
+.ti -1c
+.RI "virtual size_t \fBsize\fP () const"
+.br
+.ti -1c
+.RI "virtual QPointF \fBsample\fP (size_t index) const"
+.br
+.ti -1c
+.RI "const double * \fBxData\fP () const"
+.br
+.ti -1c
+.RI "const double * \fByData\fP () const"
+.br
+.in -1c
+.SS "Additional Inherited Members"
+.SH "Detailed Description"
+.PP 
+Data class containing two pointers to memory blocks of doubles\&. 
+.SH "Constructor & Destructor Documentation"
+.PP 
+.SS "QwtCPointerData::QwtCPointerData (const double * x, const double * y, size_t size)"
+Constructor
+.PP
+\fBParameters\fP
+.RS 4
+\fIx\fP Array of x values 
+.br
+\fIy\fP Array of y values 
+.br
+\fIsize\fP Size of the x and y arrays
+.RE
+.PP
+\fBWarning\fP
+.RS 4
+The programmer must assure that the memory blocks referenced by the pointers remain valid during the lifetime of the QwtPlotCPointer object\&.
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBQwtPlotCurve::setData()\fP, \fBQwtPlotCurve::setRawSamples()\fP 
+.RE
+.PP
+
+.SH "Member Function Documentation"
+.PP 
+.SS "QRectF QwtCPointerData::boundingRect () const\fC [virtual]\fP"
+
+.PP
+Calculate the bounding rectangle\&. The bounding rectangle is calculated once by iterating over all points and is stored for all following requests\&.
+.PP
+\fBReturns\fP
+.RS 4
+Bounding rectangle 
+.RE
+.PP
+
+.PP
+Implements \fBQwtSeriesData< QPointF >\fP\&.
+.SS "QPointF QwtCPointerData::sample (size_t index) const\fC [virtual]\fP"
+Return the sample at position i
+.PP
+\fBParameters\fP
+.RS 4
+\fIindex\fP Index 
+.RE
+.PP
+\fBReturns\fP
+.RS 4
+Sample at position i 
+.RE
+.PP
+
+.PP
+Implements \fBQwtSeriesData< QPointF >\fP\&.
+.SS "size_t QwtCPointerData::size () const\fC [virtual]\fP"
+
+.PP
+\fBReturns\fP
+.RS 4
+Size of the data set 
+.RE
+.PP
+
+.PP
+Implements \fBQwtSeriesData< QPointF >\fP\&.
+.SS "const double * QwtCPointerData::xData () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+Array of the x-values 
+.RE
+.PP
+
+.SS "const double * QwtCPointerData::yData () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+Array of the y-values 
+.RE
+.PP
+
+
+.SH "Author"
+.PP 
+Generated automatically by Doxygen for Qwt User's Guide from the source code\&.