Sections can be manually cross-listed into another
course. Teachers/admins can use the search tool to
find a course, or manually enter it's id/sis_id
to select it as a destination. Cross-listed sections
and also be manually un-cross-listed.
fixes#3759
Change-Id: I65ac76c80e7cf2703ba3c5d4c63801b6b7a348a1
Reviewed-on: https://gerrit.instructure.com/3173
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Zach Wily <zach@instructure.com>