ldap.controls in python-ldap 2.4

[Michael Ströder]

Michael Ströder wrote:
> Since I'm working more with LDAPv3 controls now I've cleaned up sub-module
> ldap.controls. Still work in progress...

Now I've checked in the modifications and updated Demo/page_control.py to make
use of the slightly new API. Also some related constants' names are now
aligned with OpenLDAP's ldap.h. Please check out HEAD and comment.

Ciao, Michael.