gnuplot 5.4.2 Release

[Ethan A M. <me...@uw...>]

Release 5.4.2 is now out

Source tarball

    https://sf.net/projects/gnuplot/files/gnuplot/5.4.2/gnuplot-5.4.2.tar.gz

Release Notes

    http://gnuplot.sourceforge.net/ReleaseNotes_5_4_2.html

The release contains lots of little fixes.  The biggest one from my
perspective is that the single-threaded version of the wxt terminal
is now usable again under linux.  Also fixed is the problem that
"set term qt persist" could leave zombie gnuplot_qt processes.

On the other hand, there are known issues under Windows 10
    Piped command input does not work reliably (Bugs #2204 #2412)
    Export to EMF file from toolbar may not work
So Windows 10 users may want to stick with version 5.2 for now.
When these problems are fixed I figure to put out a version 5.4.3
immediately that may be relevant only to Windows users.

	happy gnuplotting,

		Ethan