Update course.js

added fix to delete unit
Added temporary redirect to login.html for demo
Minor updates for using updated JSON
List editig works, sort of.
Merge remote-tracking branch 'origin/master' into back-end-working
added loader
Update course.html

added fix for refresh
Update editcourse.html

added fix for refresh
Update course.js

fix for refresh
Merge remote-tracking branch 'origin/master' into back-end-working
Improved finding users and entries; disabled revolving sessions.