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/QwtSplineCurveFitter.3

@@ -0,0 +1,203 @@
+.TH "QwtSplineCurveFitter" 3 "Mon Jun 1 2020" "Version 6.1.5" "Qwt User's Guide" \" -*- nroff -*-
+.ad l
+.nh
+.SH NAME
+QwtSplineCurveFitter \- A curve fitter using cubic splines\&.  
+
+.SH SYNOPSIS
+.br
+.PP
+.PP
+\fC#include <qwt_curve_fitter\&.h>\fP
+.PP
+Inherits \fBQwtCurveFitter\fP\&.
+.SS "Public Types"
+
+.in +1c
+.ti -1c
+.RI "enum \fBFitMode\fP { \fBAuto\fP, \fBSpline\fP, \fBParametricSpline\fP }"
+.br
+.in -1c
+.SS "Public Member Functions"
+
+.in +1c
+.ti -1c
+.RI "\fBQwtSplineCurveFitter\fP ()"
+.br
+.RI "Constructor\&. "
+.ti -1c
+.RI "virtual \fB~QwtSplineCurveFitter\fP ()"
+.br
+.RI "Destructor\&. "
+.ti -1c
+.RI "void \fBsetFitMode\fP (\fBFitMode\fP)"
+.br
+.ti -1c
+.RI "\fBFitMode\fP \fBfitMode\fP () const"
+.br
+.ti -1c
+.RI "void \fBsetSpline\fP (const \fBQwtSpline\fP &)"
+.br
+.ti -1c
+.RI "const \fBQwtSpline\fP & \fBspline\fP () const"
+.br
+.ti -1c
+.RI "\fBQwtSpline\fP & \fBspline\fP ()"
+.br
+.ti -1c
+.RI "void \fBsetSplineSize\fP (int)"
+.br
+.ti -1c
+.RI "int \fBsplineSize\fP () const"
+.br
+.ti -1c
+.RI "virtual QPolygonF \fBfitCurve\fP (const QPolygonF &) const"
+.br
+.in -1c
+.SS "Additional Inherited Members"
+.SH "Detailed Description"
+.PP 
+A curve fitter using cubic splines\&. 
+.SH "Member Enumeration Documentation"
+.PP 
+.SS "enum \fBQwtSplineCurveFitter::FitMode\fP"
+Spline type The default setting is Auto 
+.PP
+\fBSee also\fP
+.RS 4
+\fBsetFitMode()\fP, \fBFitMode()\fP 
+.RE
+.PP
+
+.PP
+\fBEnumerator\fP
+.in +1c
+.TP
+\fB\fIAuto \fP\fP
+Use the default spline algorithm for polygons with increasing x values ( p[i-1] < p[i] ), otherwise use a parametric spline algorithm\&. 
+.TP
+\fB\fISpline \fP\fP
+Use a default spline algorithm\&. 
+.TP
+\fB\fIParametricSpline \fP\fP
+Use a parametric spline algorithm\&. 
+.SH "Member Function Documentation"
+.PP 
+.SS "QPolygonF QwtSplineCurveFitter::fitCurve (const QPolygonF & points) const\fC [virtual]\fP"
+Find a curve which has the best fit to a series of data points
+.PP
+\fBParameters\fP
+.RS 4
+\fIpoints\fP Series of data points 
+.RE
+.PP
+\fBReturns\fP
+.RS 4
+Curve points 
+.RE
+.PP
+
+.PP
+Implements \fBQwtCurveFitter\fP\&.
+.SS "\fBQwtSplineCurveFitter::FitMode\fP QwtSplineCurveFitter::fitMode () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+Mode representing a spline algorithm 
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBsetFitMode()\fP 
+.RE
+.PP
+
+.SS "void QwtSplineCurveFitter::setFitMode (\fBFitMode\fP mode)"
+Select the algorithm used for building the spline
+.PP
+\fBParameters\fP
+.RS 4
+\fImode\fP Mode representing a spline algorithm 
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBfitMode()\fP 
+.RE
+.PP
+
+.SS "void QwtSplineCurveFitter::setSpline (const \fBQwtSpline\fP & spline)"
+Assign a spline
+.PP
+\fBParameters\fP
+.RS 4
+\fIspline\fP Spline 
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBspline()\fP 
+.RE
+.PP
+
+.SS "void QwtSplineCurveFitter::setSplineSize (int splineSize)"
+Assign a spline size ( has to be at least 10 points )
+.PP
+\fBParameters\fP
+.RS 4
+\fIsplineSize\fP Spline size 
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBsplineSize()\fP 
+.RE
+.PP
+
+.SS "\fBQwtSpline\fP & QwtSplineCurveFitter::spline ()"
+
+.PP
+\fBReturns\fP
+.RS 4
+Spline 
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBsetSpline()\fP 
+.RE
+.PP
+
+.SS "const \fBQwtSpline\fP & QwtSplineCurveFitter::spline () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+Spline 
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBsetSpline()\fP 
+.RE
+.PP
+
+.SS "int QwtSplineCurveFitter::splineSize () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+Spline size 
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBsetSplineSize()\fP 
+.RE
+.PP
+
+
+.SH "Author"
+.PP 
+Generated automatically by Doxygen for Qwt User's Guide from the source code\&.