Change Password Channel and Active Directory support

There is a bug in this channel that prevents it from working when you have a hierarchical directory structure. It will work fine with a flat structure. To workaround this, you can apply the attached patch which updates the channel to perform subtree scoped LDAP searching. To install this, simply replace the current CLdapChangePW.class file which is located at $TOMCAT_HOME/webapps/portal/WEB-INF/classes/net/unicon/portal/channels/ldapchangepw. This patch applies to both Academus 2.0 and 2.1.