Hello.

smbldap-tools hardcode rfc2307 classes schema. The alternative rfc2307bis uses dn instead of uid for group membership, make posixGroup a non-structural class, and use groupOfNames instead. Additional, it prevents empty groups to be created.

The following patch makes this configurable, by allowing to define the list of classes to be used when creating groups. Alternatively, a 'schema' item could have been used (as in pam_ldap), so as to automatically determine which list of classes to use, but I found this system more generic (it would also be useful for users to define the list of classes to use).