Finish(external data): cron, mapping, offers, etc.

• Setup cron to automatically update remote data
• Support partial (login based) utc data update
• Tweaked models to record untouched or unlincked situations
• take them into account in the front and the back,
• Auto creation of general feedback also
• Added info about unlinked utc partners in the front
• Added button to request update ent data
• Added university offer module to the front

Other:

• Tweaked loading scripts
• tweaked models
• Fixed SelectField

Closes #28 (closed)