[scribus] Changing page size from a script

[Adam]

Hello,
I'm using a script to automatically lay out a file of scanned images, 
one image per page. Ideally, I'd like to be able to change the page size 
to match the image dimensions. I haven't seen a way to do this from a 
script. Does anyone know if this is possible?

A related question: where are the Scribus python functions/methods that 
are available from scripts defined? Is there some way to define new 
functions?

Thanks very much for your help,
Adam