new branch which introduces display names
first commit with some infrastructure code
add display name to title instead if login-ID
get all display names
get all display names from users in a given group
compare the correct uids
allow to get the display name from an abitrary user
show display name instead of uid in the public shared files view
show display name instead of uid
use display name to show share_width and owner information
typo fixed
change order, key -> uid and value -> display name, this way it is also possible to have non-unique display names
prepare user table to show and edit display names
interface and API to change display names
update the display name for the database back-end
add display name to the database table oc_users
implement display names for the database back-end
implement  DisplayNamesInGroup for database back-end
search display name instead of uid; fix key/value order for array access
show display name in input field
rename Name to Login Name