subplot debug mode

[seisman]

Description of the problem

I have an old script which uses the undocumented +d modifier of subplot -F. I believe it worked when I wrote it, but now it doesn't make sense anymore. We need to either fix it or totally remove it, as subplot -F already has +p and +w for debugging purpose, right?

#!/usr/bin/env bash
gmt begin subplot 
gmt subplot begin 2x2 -Fs5c/3c+d -Blrtb
	gmt basemap -R0/10/0/10 -c
	gmt basemap -R0/10/0/10 -c
	gmt basemap -R0/10/0/10 -c
	gmt basemap -R0/10/0/10 -c
gmt subplot end
gmt end show

Output:

[PaulWessel]

OK, will look after another zoom about to start. Almost looks like a 2.54 factor, no?