AK Slides

This introduces slide generation for AKs of an event (#66 (closed)).

Features:

• Introduce latex export
• Slides of AKs grouped by their category
• Exclude wishes and display as own category
• Show next two AKs in footer for presenter preparation
• Allow to choose whether all AKs or only the ones with presentation flag should be shown

AKModel/models.py

@@ -264,7 +264,7 @@ class AK(models.Model):
 
     @property
     def durations_list(self):
-        return ", ".join(str(slot.duration) for slot in self.akslot_set.all())
+        return ", ".join(str(slot.duration_simplified) for slot in self.akslot_set.all())
 
     @property
     def tags_list(self):