getETagPropertyForFile -> getETagPropertyForPath
removeETagPropertyForFile -> removeETagPropertyForPath

LDAP: check if php-ldap is installed. If not, give an error output. FIX: blank Users page when the module is not installed.

LDAP: split up LIB_LDAP into Access for LDAP interaction functions and Connection for configuration and resource management. Adjust user_ldap, group_ldap and the app accordingly.

LDAP: switch user backend from extending class OC_User_Backend to implementing OC_User_Interface for improved flexibility