Please review and test preliminary support for LDAP controls

[Michael Ströder]

Dear python-ldap users!

Thanks to the contributions of Deepak Giridharagopal, there's now 
preliminary support for LDAP controls in python-ldap.

Up to now the application has to do the BER encoding itself with the 
help of a third-party module. But looking at Demo/ldapcontrols.py and 
sub-module ldap.controls should give you an idea how it's supposed to work.

Anyway I'd appreciate every one's feedback whether the modifications in 
class LDAPControl and the sub-module ldap.controls seems suitable. So 
please bring your CVS working dir in sync and test. Thanks!

Ciao, Michael.