User role management with LDAP Groups

Hi,

I extended your code to fit the plugin to our needs.

I added the following features:

User's roles can be managed by OpenLDAP: The user's roles are allocated to LDAP Groups. If a user is member of a group, he obtains the matching role.  The groups to roles allocation can be configured in the wordpress admin interface. If the user is not in an allocated group, a default role is used.

LDAP filter syntax is used to search for user dn and group dn. This makes the plugin much more flexible to different LDAP configurations. The filter can be configured in the admin interface.

After every login, the user details can be synchronized to the LDAP entries. This feature can be activated or deactivated in the wp admin interface. 




In the default configuration, my code should behave like your default configuration. 

It would be nice if you could merge some or even all of this features into your default code. So it would be much more easy for me to update the plugin. 

Kind regards,
Christian