Resolve "Add student view with further information"

Closes #93 und #92

See merge request !80

Merge branch '79-filter-selects-on-week-overview-and-register-absence' into '73-add-rules-and-permissions'

Resolve "Filter selects on week overview and register absence"

See merge request !72

Merge branch '73-add-rules-and-permissions' into '79-filter-selects-on-week-overview-and-register-absence'

# Conflicts:
#   aleksis/apps/alsijil/forms.py

Resolve "Fix register absence form"

Closes #96

See merge request !84

Filter person dropdown list of absence registration form with custom queryset instead of queryset_rules_filter

Merge branch '73-add-rules-and-permissions' into 79-filter-selects-on-week-overview-and-register-absence

Resolve "Allow teachers opening lessons on the same day before they start"

Closes #95

See merge request !83