LDPA: group settings into basic and advanced to look less crowded. Still needs some love. Looks different to the other admin settings, though.

This now re-looks up the username and returns that for use.

Signed-off-by: Insanemal <insanemal@gmail.com>

This resolves bug with Windows AD servers as LDAP server.
Windows is case insensitve on logon requests.
If users are stored camel case and logon using all lower it causes issues
as OwnCloud is configured to be case sensitive.

Signed-off-by: Insanemal <insanemal@gmail.com>

- provide a setting for the ldap user display name instead of hardcoded value 'uid' which is not common for Active Directory
- provide a sorted list of ldap users
- replaced double quotes by single quotes and spaces by tabs according to coding standards
- replaced hardcoded strings in template by translatable ones

- added explaination how to setup anonymous bind for search to template
- make usage of TLS configurable