Log Message:
gnuplot: updated to 5.4.8

Changes in 5.4.8

FIX version reporting in Windows binaries
No other changes

Changes in 5.4.7

FIX pseudofiles '+','++' must ignore "set datafile columnheader"
FIX data from an array must ignore "set datafile columnheader"
FIX data from an array must ignore "set datafile separator"
FIX various problems with unbounded plot iteration
FIX allow plot ... smooth acsplines with filledcurves
FIX "plot title at {end|beginning}" belongs in KEYSAMPLE layer
FIX handle empty string in last field of csv file
FIX Handle nonlinear axes during contour generation
FIX yerrorbars key sample should match bars in the plot
FIX "plot with table" must skip all smoothing operations
FIX cairolatex/epslatex: prevent doubled text in opaque textboxes
FIX wxt: versions prior to 3.0 do not support XDG
FIX wxt: fontscale and fontsize handling was inconsistent
FIX correctly report cardinality of an empty array is zero
FIX combination of pm3d options "at b" or "at t" with \ 
"depthorder"
FIX combination of 'autotitle columnhead' and 'using col("key")'
FIX do not complain if XDG files are not found because no $HOME
FIX windows terminal: arrow length corrected for aspect ratio
tikz epslatex cairolatex terminals updated to work with TeXLive2023