updated print.m

[Ben Abbott]

I've pushed a changeset that addresses some of the troubles reported  
for printing, and have tried to cc all that reported problems.

With this changeset in place, only postscript and pdf output are  
assumed to target a printed page. All other outputs (eps, emf, png,  
etc) will render an image the size indicated by the figure's  
paperposition property.

Regarding pdf output, some linux variants do not have a "pdf" terminal  
included. In the event gnuplot does not directly support pdf output a  
check is made to see if "convert" is present. If so, a postscript page  
is produced and "convert" is used to render the desired pdf output.

I've also updated the help text  for print.m and made some changes to  
clarify the code.

Ben

changeset-pdf.patch
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