[scribus] center the image inside the frame

[a.l.e]

hi john jason,

> After finally getting the script where I thought it should be I
> launched Scribus. However, the script did not appear in the list in
> Scripts > Scribus Scripts, so apparently I put it in the wrong folder.
> Nevertheless, I was able to run it by finding it with Scripts >
> Execute Script.

this is afaik the correct way to run a script.

only the scripts distributed with scribus will show up in the list of
the scripts.

ciao
a.l.e