Adjust list tables to be without borders

* Further add links to persons of applications
  for leave in applications list.

* Adjust link and action colors to be more
  decent.
Fix broken state filter in applications for leave list

* Now always both parameters are concerned,
  selected year and selected state, to display
  the applications for leave.
Change tables on the overview page to bordered tables

* Else the contrast is too high, relative to the
  info boxes on the overview page.
Add styling for sick notes list page
Add redirect for default sick notes url `/sicknote`
Add styling for sick notes filter modal dialog.
Add styling for sick note form and details