'paperpositionmode' change to rid gnuplot_set_term: size is zero

[John W. Eaton]

On 23-Jan-2009, Ben Abbott wrote:

| 
| On Jan 5, 2009, at 7:20 AM, Ben Abbott wrote:
| 
| *snip*
| 
| > Michael/others,
| >
| > I've essentially mimicked prior examples in order to set the  
| > defaults for ...
| >
| > axes.xticks
| > axes.yticks
| > axes.zticks
| > figure.papersize
| > figure.paperposition
| > root.screensize
| >
| > I've also attempted to add the "character" unit to  
| > graphics:convert_positon(...)
| 
| *snip*
| 
| As John as done a proper implementation for too.screensize, I thought  
| I'd produce a update the my earlier changeset.

OK, please commit this changeset.

Thanks,

jwe