pre-release testing version of gnuplot 5.2.3

[sfeam <sf...@us...>]

I have uploaded a 5.2.3 tarball to the "testing" section of the
gnuplot files folder on SourceForge.
   
    https://sourceforge.net/projects/gnuplot/files/gnuplot/testing/
    gnuplot-5.2.3-testing.tar.gz


So far as I know there is nothing unusual about this patchlevel
release.  It is the usual mix of bugfixes and a few features 
back-ported from the development version.  However it is the first
release tarball prepared from a git branch rather than from our
old cvs repository.  That shouldn't make any difference but I
suppose it is possible that something comes out a little different.

Please use the testing tarball to confirm a successful build or
report build errors.  If no problems are found I expect to make a
regular release of 5.2.3 next week.

	Ethan