Log Message:
gnuplot: updated to 5.4.5

Changes in 5.4.5

NEW "set key offset <dx>, <dy>" tweaks placement of the key
NEW data-driven histogram colors (variable color from extra using column)
CHANGE re-order drawing 3D labels to come after pm3d depthorder surfaces
CHANGE hpgl: add terminal option "fontscale <value>"
CHANGE for nonuniform matrix data, column(0) returns linear position in matrix
CHANGE set pointintervalbox 0 disables drawing the background box Bug
FIX svg: hypertext font handling
FIX track columnheaders of multiple data blocks in a single file Bug
FIX Clean up positioning of polar border, raxis, and theta tics Bug
FIX Autoscaling of logscaled raxis
FIX memory corruption if a small plot structure is recycled Bug
FIX regression in 5.4.4 - promotion of string to integer should not assume that \ 
a leading 0 means octal Bug
FIX Windows qt: "pause -1" should not block mousing Bug
FIX invalid free of active datablock