Does not work.

ref #107

Enable using multiple authentication backends.
(Samba-)AD and LDAP-Backends are implemented.
Session timeouts are implemented.

/close #17

ref #7

/close #21

/close #45

/close #86

/close #89

If there are todos which have todo.who == current_user.username, show
only them, as there may be quite a lot of open todos in total.

/close #90

/close #92

e.g. [todo:who:what]
e.g. [todo;who]

/close #95

/close #98

/close #99
/close #91

Create LocalTOPs when creating Protocols or DefaultTOPs, not on demand
when necessary, since that created double entries.

reference #96

Rechtschreibung korrigiert (todo-mail)

See merge request !3

/close #83

/close #81

/close #82

/close #67

/close #80

/close #79

/close #78

/close #77

/close #78

/close #74