[changeset] printing multipage postscript files

[Petr Mikulik]

> Please check that this works are you expect. I've tested the three examples
> below on Mac OSX with no problems.
> 
> surf(peaks)
> print -dps append.ps
> sombrero (25)
> print -dps -append append.ps
> 
> surf(peaks)
> print -dpdf append.pdf
> sombrero (25)
> print -dpdf -append append.pdf
> 
> surf(peaks)
> print -dps append.ps
> rename ("appdend.ps", "append.pdf");
> sombrero (25)
> print -dpdf -append append.pdf
> 
> The last one I hadn't expected to work, but ghostscript handled it nicely.

With postscript, it works well. (The option is really "-append".)

However, appending to pdf fails on my system:

x=1:100;
plot (x,x)
print -dpdf z.pdf
plot (x,-x)
print -dpdf z.pdf -append
plot (x,x.*x, x,x+20)
print -dpdf z.pdf -append

However
   gs -dNOPAUSE -sDEVICE=pswrite -sOutputFile=new.pdf \
   z1.pdf z2.pdf -c quit
works OK, so there seems to be a some small mistake in the patch. Can you 
please fix it?

---
Petr Mikulik