define a new icon on organisation instead of document_icon.gif. The original I use is available there : http://commons.wikimedia.org/wiki/File:Enterprise_buildings_icons.png and is in public domain.

Reviewed by thierry

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39900 20353a03-c40f-0410-a6d1-a30d3c3de9de