SAK-5350 Dropbox: ability for instructor to send file to multiple students' dropboxes
Patch from Alexandre Ballesté alex@asic.udl.cat, tweaks by AZ



git-svn-id: https://source.sakaiproject.org/svn/content/trunk@125737 66ffb92e-73f9-0310-93c1-f5514f145a0a