Introducing simple user profiles (Pt.2).

Features:
- Editing of 1 contact information possible now
- rendering adapted to show display_name (if available) across all views

Pending:
- tag-filter-view, login-menu and user-menu still interfere
  (if screen-width is not so wide needs revision)
- integrate the detail-view into the index-page (making it all ajax-single)
- Redo Layout (Add logo and support IE9, Opera)
- move more edit-related functions into a more private scope
- commit changes from here also into the ck-mathjax repository

Note:
Installation depends on DeepaMehta 4.1.1-SNAPSHOT as of commit:
ca61964a27e6757848e638c3bafc9374c6aff45c

Documentation:
https://www.eduzen.tu-berlin.de/software-komponenten (German)
https://www.eduzen.tu-berlin.de/zur-notizen-webanwendung (German / Get User Account)