Introduce sick note type

* A sick note has now a type: either own sick note
  or child sick note.

* Update existing sick note data by setting own sick
  note as type.

* refs #17659
Add print rule for forms to be not visible
Mark applications for leave that are not of type holiday

* Applications for leave that are not of type holiday,
  i.e. special leave, overtime reducing or unpaid leave,
  are marked in another color than holiday.
Add possibility to create child sick notes

* In sick note form there is now a type choice:
  own sick note or child sick note.

* Adjust overview and sick note details to
  show different icons for the both sick note
  types.

* refs #17659
Overview: show number of sick days with AUB

* Instead of showing number of AUBs on overview page,
  show number of sick days with AUB to be able to
  compare how many of the sick days of a person have
  an AUB.

* refs #17660
Show sick notes on overview page ordered by date

* refs #17660