bug in wx terminal for linewidth 0

[Petr M. <mi...@ph...>]

It seems that WXT is incorrectly setting the linewidth 0 to be really a zero 
thickness, instead of the smallest linewidth achievable (as all other 
terminals are doing).

Compare:

plot sin(x) w l lw 0, cos(x) w l lw 1
set term wxt; replot
set term png size 900,700; set out 'a.png'; replot
set term post color; set out 'a.ps'; replot
set term fig color; set out 'a.fig'; replot

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PM