Item11705: Multiple fixes to BulkRegistration

 - Make the unit tests actually test something
 - Don't require the password "Confirm" field
 - Don't add the user if validations fail.
 - Update the documentation

git-svn-id: http://svn.foswiki.org/trunk/core@17777 0b4bb1d4-4e5a-0410-9cc4-b2b747904278