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/QwtSetSample.3

@@ -0,0 +1,77 @@
+.TH "QwtSetSample" 3 "Mon Jun 1 2020" "Version 6.1.5" "Qwt User's Guide" \" -*- nroff -*-
+.ad l
+.nh
+.SH NAME
+QwtSetSample \- A sample of the types (x1\&.\&.\&.xn, y) or (x, y1\&.\&.yn)  
+
+.SH SYNOPSIS
+.br
+.PP
+.PP
+\fC#include <qwt_samples\&.h>\fP
+.SS "Public Member Functions"
+
+.in +1c
+.ti -1c
+.RI "\fBQwtSetSample\fP ()"
+.br
+.ti -1c
+.RI "\fBQwtSetSample\fP (double, const QVector< double > &=QVector< double >())"
+.br
+.ti -1c
+.RI "bool \fBoperator==\fP (const \fBQwtSetSample\fP &other) const"
+.br
+.RI "Compare operator\&. "
+.ti -1c
+.RI "bool \fBoperator!=\fP (const \fBQwtSetSample\fP &other) const"
+.br
+.RI "Compare operator\&. "
+.ti -1c
+.RI "double \fBadded\fP () const"
+.br
+.in -1c
+.SS "Public Attributes"
+
+.in +1c
+.ti -1c
+.RI "double \fBvalue\fP"
+.br
+.RI "value "
+.ti -1c
+.RI "QVector< double > \fBset\fP"
+.br
+.RI "Vector of values associated to value\&. "
+.in -1c
+.SH "Detailed Description"
+.PP 
+A sample of the types (x1\&.\&.\&.xn, y) or (x, y1\&.\&.yn) 
+.SH "Constructor & Destructor Documentation"
+.PP 
+.SS "QwtSetSample::QwtSetSample ()\fC [inline]\fP"
+Constructor The value is set to 0\&.0 
+.SS "QwtSetSample::QwtSetSample (double v, const QVector< double > & s = \fCQVector<double>()\fP)\fC [inline]\fP"
+Constructor
+.PP
+\fBParameters\fP
+.RS 4
+\fIv\fP Value 
+.br
+\fIs\fP Set of values 
+.RE
+.PP
+
+.SH "Member Function Documentation"
+.PP 
+.SS "double QwtSetSample::added () const\fC [inline]\fP"
+
+.PP
+\fBReturns\fP
+.RS 4
+All values of the set added 
+.RE
+.PP
+
+
+.SH "Author"
+.PP 
+Generated automatically by Doxygen for Qwt User's Guide from the source code\&.