Add link from training to corporation contact
Remember section/periode on attribution page
Export training comment in export view
Sort training list by student names
Updated DB schema documentation
Reset contact select when adding new training
Add institution detail view with stats
Keep 1.4 compatibility in templates
Improvement to corporation.html template
Change default ordering and unicode repr for Periode
Retrieve student list depending on current time and period time

If I plan a period for next year, I should obtain the students for
the period level minus one.
Forgotten new utils file