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/QwtLegendData.3

@@ -0,0 +1,215 @@
+.TH "QwtLegendData" 3 "Mon Jun 1 2020" "Version 6.1.5" "Qwt User's Guide" \" -*- nroff -*-
+.ad l
+.nh
+.SH NAME
+QwtLegendData \- Attributes of an entry on a legend\&.  
+
+.SH SYNOPSIS
+.br
+.PP
+.PP
+\fC#include <qwt_legend_data\&.h>\fP
+.SS "Public Types"
+
+.in +1c
+.ti -1c
+.RI "enum \fBMode\fP { \fBReadOnly\fP, \fBClickable\fP, \fBCheckable\fP }"
+.br
+.RI "Mode defining how a legend entry interacts\&. "
+.ti -1c
+.RI "enum \fBRole\fP { \fBModeRole\fP, \fBTitleRole\fP, \fBIconRole\fP, \fBUserRole\fP = 32 }"
+.br
+.RI "Identifier how to interprete a QVariant\&. "
+.in -1c
+.SS "Public Member Functions"
+
+.in +1c
+.ti -1c
+.RI "\fBQwtLegendData\fP ()"
+.br
+.RI "Constructor\&. "
+.ti -1c
+.RI "\fB~QwtLegendData\fP ()"
+.br
+.RI "Destructor\&. "
+.ti -1c
+.RI "void \fBsetValues\fP (const QMap< int, QVariant > &)"
+.br
+.ti -1c
+.RI "const QMap< int, QVariant > & \fBvalues\fP () const"
+.br
+.ti -1c
+.RI "void \fBsetValue\fP (int role, const QVariant &)"
+.br
+.ti -1c
+.RI "QVariant \fBvalue\fP (int role) const"
+.br
+.ti -1c
+.RI "bool \fBhasRole\fP (int role) const"
+.br
+.ti -1c
+.RI "bool \fBisValid\fP () const"
+.br
+.ti -1c
+.RI "\fBQwtGraphic\fP \fBicon\fP () const"
+.br
+.ti -1c
+.RI "\fBQwtText\fP \fBtitle\fP () const"
+.br
+.ti -1c
+.RI "\fBMode\fP \fBmode\fP () const"
+.br
+.in -1c
+.SH "Detailed Description"
+.PP 
+Attributes of an entry on a legend\&. 
+
+\fBQwtLegendData\fP is an abstract container ( like QAbstractModel ) to exchange attributes, that are only known between to the plot item and the legend\&.
+.PP
+By overloading \fBQwtPlotItem::legendData()\fP any other set of attributes could be used, that can be handled by a modified ( or completely different ) implementation of a legend\&.
+.PP
+\fBSee also\fP
+.RS 4
+\fBQwtLegend\fP, \fBQwtPlotLegendItem\fP 
+.RE
+.PP
+\fBNote\fP
+.RS 4
+The stockchart example implements a legend as a tree with checkable items 
+.RE
+.PP
+
+.SH "Member Enumeration Documentation"
+.PP 
+.SS "enum \fBQwtLegendData::Mode\fP"
+
+.PP
+Mode defining how a legend entry interacts\&. 
+.PP
+\fBEnumerator\fP
+.in +1c
+.TP
+\fB\fIReadOnly \fP\fP
+The legend item is not interactive, like a label\&. 
+.TP
+\fB\fIClickable \fP\fP
+The legend item is clickable, like a push button\&. 
+.TP
+\fB\fICheckable \fP\fP
+The legend item is checkable, like a checkable button\&. 
+.SH "Member Function Documentation"
+.PP 
+.SS "bool QwtLegendData::hasRole (int role) const"
+
+.PP
+\fBParameters\fP
+.RS 4
+\fIrole\fP Attribute role 
+.RE
+.PP
+\fBReturns\fP
+.RS 4
+True, when the internal map has an entry for role 
+.RE
+.PP
+
+.SS "\fBQwtGraphic\fP QwtLegendData::icon () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+Value of the IconRole attribute 
+.RE
+.PP
+
+.SS "bool QwtLegendData::isValid () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+True, when the internal map is empty 
+.RE
+.PP
+
+.SS "\fBQwtLegendData::Mode\fP QwtLegendData::mode () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+Value of the ModeRole attribute 
+.RE
+.PP
+
+.SS "void QwtLegendData::setValue (int role, const QVariant & data)"
+Set an attribute value
+.PP
+\fBParameters\fP
+.RS 4
+\fIrole\fP Attribute role 
+.br
+\fIdata\fP Attribute value
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBvalue()\fP 
+.RE
+.PP
+
+.SS "void QwtLegendData::setValues (const QMap< int, QVariant > & map)"
+Set the legend attributes
+.PP
+\fBQwtLegendData\fP actually is a QMap<int, QVariant> with some convenience interfaces
+.PP
+\fBParameters\fP
+.RS 4
+\fImap\fP Values 
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBvalues()\fP 
+.RE
+.PP
+
+.SS "\fBQwtText\fP QwtLegendData::title () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+Value of the TitleRole attribute 
+.RE
+.PP
+
+.SS "QVariant QwtLegendData::value (int role) const"
+
+.PP
+\fBParameters\fP
+.RS 4
+\fIrole\fP Attribute role 
+.RE
+.PP
+\fBReturns\fP
+.RS 4
+Attribute value for a specific role 
+.RE
+.PP
+
+.SS "const QMap< int, QVariant > & QwtLegendData::values () const"
+
+.PP
+\fBReturns\fP
+.RS 4
+Legend attributes 
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBsetValues()\fP 
+.RE
+.PP
+
+
+.SH "Author"
+.PP 
+Generated automatically by Doxygen for Qwt User's Guide from the source code\&.