Blanks removed
Rework code to ommit unnecessary filter call.
Use permission 'can_see_orga_items' also to show/hide duration column and agenda time scheduling. (via Emanuel)
Agenda orga items and time scheduling: Formatting improved. Use permission 'can_see_orga_items' also to show/hide duration column and agenda time scheduling. (via Emanuel)
ConfigForm: Base classes reordered
Item type changed from CharField to IntegerField. Constant type names added.
Create items with duration loger than 23:59. Show start and end date. Duration has tooltip showing end date and time.
Changed agenda start/end time to djangos DATETIME_FORMAT.