Introduce user count action to user management
Add command line tool to show numbers of users and user directories
LDAP: implement userCount action. This required to (finally) clean up and refactor the search method, which will have a positive performance impact on paged search.
remove unnecessary line
LDAP: add tests for countUsers
if backends have the same class name, sum their users up instead of overwriting
add tests for user counting
Infowarning about 32bit