Finished removing class_key references. Changed datamodel to work with any group_id. Tested install and upgrade scripts. Tested that course upload and play in lorsm works in .LRN.
- Allowing to upload new version of resource files. It doesnt matter wich mime_type the resource has. - Allowing to edit names of learning objects. - Showing which version of the resource is the live version in some listbuilders. - Fixing some typos.