Drop version pins for ZTK versions not being used by Zope 2.

versions.cfg

@@ -30,24 +30,3 @@ z3c.checkversions = 0.5
 zc.buildout = 2.5.2
 zc.recipe.egg = 2.0.3
 zc.recipe.testrunner = 2.0.0
-zope.applicationcontrol = 4.0.1
-zope.authentication = 4.2.1
-zope.catalog = 4.1.0
-zope.copy = 4.0.3
-zope.copypastemove = 4.0.0
-zope.datetime = 4.1.0
-zope.dublincore = 4.1.1
-zope.error = 4.3.0
-zope.hookable = 4.0.4
-zope.index = 4.2.0
-zope.intid = 4.1.0
-zope.keyreference = 4.1.0
-zope.login = 2.0.0
-zope.mimetype = 2.0.0
-zope.minmax = 2.1.0
-zope.password = 4.2.0
-zope.pluggableauth = 2.1.0
-zope.principalannotation = 4.1.1
-zope.principalregistry = 4.0.0
-zope.securitypolicy = 4.0.0
-zope.session = 4.1.0