[ODFPlugtest] Alternate text on images in spreadsheet

[robert_weir at us.ibm.com]

I did some more testing and some initial analysis on the alt text 
scenario:

http://plugtest.opendocsociety.org/doku.php?id=scenarios:20090615:alternate

I'd be interested in any confirmation of my findings, especially with 
other editors.

Regards,

-Rob