ugly png plots in 3.1.54

[Francesco Potorti`]

When printing a plot with print("file.png") the plot is in portrait
mode.

Until 3.1.51, the default PNG size was a sane 640x480.  In 3.1.52 it
became 576x432, that is, 90% than before.  In 3.1.54 it is 612x792,
which is portrait and does not fit well with the landscape format of
gnuplot's plots.  The relevant gnuplot line is:

  set terminal png enhanced size 612,792 large;

For both PNG and SVG, forcing 640x480 by using
print("file.png","-dpng","-S640,480") produces somewhat squashed plots,
with too big margins on top and bottom of the plots.

-- 
Francesco Potortì (ricercatore)        Voice: +39 050 315 3058 (op.2111)
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