use single quotes

prepare release 2.5.1

* The methods SSSResponseControl.decodeControlValue() and

  VLVResponseControl.decodeControlValue() now follow the coding
  convention to use camel-cased ASN.1 name as class attribute name.
  The old class names are still set for back-ward compability
  but should not be used in new code because they might be removed
  in a later release.
* removed SSSRequestControl from ldap.controls.KNOWN_RESPONSE_CONTROLS

prepare release 2.4.45

prepare release 2.4.44

prepare release 2.4.43

prepare release 2.4.42

Added test for increment: lines in LDIF changes records

release 2.4.40 now

prepare release 2.4.39