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/QwtColumnRect.3

@@ -0,0 +1,97 @@
+.TH "QwtColumnRect" 3 "Mon Jun 1 2020" "Version 6.1.5" "Qwt User's Guide" \" -*- nroff -*-
+.ad l
+.nh
+.SH NAME
+QwtColumnRect \- Directed rectangle representing bounding rectangle and orientation of a column\&.  
+
+.SH SYNOPSIS
+.br
+.PP
+.PP
+\fC#include <qwt_column_symbol\&.h>\fP
+.SS "Public Types"
+
+.in +1c
+.ti -1c
+.RI "enum \fBDirection\fP { \fBLeftToRight\fP, \fBRightToLeft\fP, \fBBottomToTop\fP, \fBTopToBottom\fP }"
+.br
+.RI "Direction of the column\&. "
+.in -1c
+.SS "Public Member Functions"
+
+.in +1c
+.ti -1c
+.RI "\fBQwtColumnRect\fP ()"
+.br
+.RI "Build an rectangle with invalid intervals directed BottomToTop\&. "
+.ti -1c
+.RI "QRectF \fBtoRect\fP () const"
+.br
+.ti -1c
+.RI "Qt::Orientation \fBorientation\fP () const"
+.br
+.in -1c
+.SS "Public Attributes"
+
+.in +1c
+.ti -1c
+.RI "\fBQwtInterval\fP \fBhInterval\fP"
+.br
+.RI "Interval for the horizontal coordinates\&. "
+.ti -1c
+.RI "\fBQwtInterval\fP \fBvInterval\fP"
+.br
+.RI "Interval for the vertical coordinates\&. "
+.ti -1c
+.RI "\fBDirection\fP \fBdirection\fP"
+.br
+.RI "Direction\&. "
+.in -1c
+.SH "Detailed Description"
+.PP 
+Directed rectangle representing bounding rectangle and orientation of a column\&. 
+.SH "Member Enumeration Documentation"
+.PP 
+.SS "enum \fBQwtColumnRect::Direction\fP"
+
+.PP
+Direction of the column\&. 
+.PP
+\fBEnumerator\fP
+.in +1c
+.TP
+\fB\fILeftToRight \fP\fP
+From left to right\&. 
+.TP
+\fB\fIRightToLeft \fP\fP
+From right to left\&. 
+.TP
+\fB\fIBottomToTop \fP\fP
+From bottom to top\&. 
+.TP
+\fB\fITopToBottom \fP\fP
+From top to bottom\&. 
+.SH "Member Function Documentation"
+.PP 
+.SS "Qt::Orientation QwtColumnRect::orientation () const\fC [inline]\fP"
+
+.PP
+\fBReturns\fP
+.RS 4
+Orientation 
+.RE
+.PP
+
+.SS "QRectF QwtColumnRect::toRect () const\fC [inline]\fP"
+
+.PP
+\fBReturns\fP
+.RS 4
+A normalized QRect built from the intervals 
+.RE
+.PP
+
+
+.SH "Author"
+.PP 
+Generated automatically by Doxygen for Qwt User's Guide from the source code\&.