* improve documentation for key: True flag in attributes.yml
* improve documentation for the ldap filters and their templating
* improve comment in the .ini file
* add display_name parameter for backend
* handle display_name in modify template (lonely groups) and error
message
* fix bug in modify when user is in only one backend
* remove redondant exception in ad/ldap backend
* fix unit test accordingly
* fix License in AD backend (GPLv3 -> MIT, previously tought of using
samba4 python library which is GPL, but this module finaly uses
python-ldap which is MIT compatible)
Oh god, python-ldap is crap...
* add better unit test
* correct params name
* correct exception handling
* disable testConnectSSLNoCheck (impossible to test with a certificate
previously defined)
* change parameters name for Backend Ldap
* fix default value handling in backends get_param
* correct exception in backends get_param
* fix syntaxe error
* add backend name in test_BackendLdap.py