SAK-26263 signup tables part of Sakai 10 upgrade


git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@309743 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-26263 move calendar_event_id back to 2000 chars because it can be concatenated


git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@309745 66ffb92e-73f9-0310-93c1-f5514f145a0a